From 4d36a0707a21ee883d1ab167781b7b198798aad5 Mon Sep 17 00:00:00 2001
From: Saumya Talwani <68903741+saumyatalwani@users.noreply.github.com>
Date: Thu, 19 Feb 2026 07:57:11 +0530
Subject: [PATCH] test: add tests for base > date-time-picker (#32396)

---
 .../calendar/days-of-week.spec.tsx            |  24 +
 .../calendar/index.spec.tsx                   | 114 ++++
 .../calendar/item.spec.tsx                    | 137 ++++
 .../common/option-list-item.spec.tsx          | 137 ++++
 .../date-picker/footer.spec.tsx               |  97 +++
 .../date-picker/header.spec.tsx               |  78 +++
 .../date-picker/index.spec.tsx                | 616 +++++++++++++++++
 .../base/date-and-time-picker/hooks.spec.ts   |  94 +++
 .../time-picker/footer.spec.tsx               |  50 ++
 .../time-picker/header.spec.tsx               |  30 +
 .../time-picker/index.spec.tsx                | 644 ++++++++++++++++--
 .../time-picker/options.spec.tsx              |  97 +++
 .../utils/dayjs-extended.spec.ts              | 366 ++++++++++
 .../year-and-month-picker/footer.spec.tsx     |  50 ++
 .../year-and-month-picker/header.spec.tsx     |  47 ++
 .../year-and-month-picker/options.spec.tsx    |  81 +++
 16 files changed, 2624 insertions(+), 38 deletions(-)
 create mode 100644 web/app/components/base/date-and-time-picker/calendar/days-of-week.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/calendar/index.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/calendar/item.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/common/option-list-item.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/date-picker/footer.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/date-picker/header.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/date-picker/index.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/hooks.spec.ts
 create mode 100644 web/app/components/base/date-and-time-picker/time-picker/footer.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/time-picker/header.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/time-picker/options.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/utils/dayjs-extended.spec.ts
 create mode 100644 web/app/components/base/date-and-time-picker/year-and-month-picker/footer.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/year-and-month-picker/header.spec.tsx
 create mode 100644 web/app/components/base/date-and-time-picker/year-and-month-picker/options.spec.tsx

diff --git a/web/app/components/base/date-and-time-picker/calendar/days-of-week.spec.tsx b/web/app/components/base/date-and-time-picker/calendar/days-of-week.spec.tsx
new file mode 100644
index 0000000000..334b6fdbe9
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/calendar/days-of-week.spec.tsx
@@ -0,0 +1,24 @@
+import { render, screen } from '@testing-library/react'
+import { DaysOfWeek } from './days-of-week'
+
+describe('DaysOfWeek', () => {
+  // Rendering test
+  describe('Rendering', () => {
+    it('should render 7 day labels', () => {
+      render(<DaysOfWeek />)
+
+      // The global i18n mock returns keys like "time.daysInWeek.Sun"
+      const dayElements = screen.getAllByText(/daysInWeek/)
+      expect(dayElements).toHaveLength(7)
+    })
+
+    it('should render each day of the week', () => {
+      render(<DaysOfWeek />)
+
+      const days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat']
+      days.forEach((day) => {
+        expect(screen.getByText(new RegExp(day))).toBeInTheDocument()
+      })
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/calendar/index.spec.tsx b/web/app/components/base/date-and-time-picker/calendar/index.spec.tsx
new file mode 100644
index 0000000000..51104864bb
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/calendar/index.spec.tsx
@@ -0,0 +1,114 @@
+import type { CalendarProps, Day } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import dayjs from '../utils/dayjs'
+import Calendar from './index'
+
+// Mock scrollIntoView since jsdom doesn't implement it
+beforeAll(() => {
+  Element.prototype.scrollIntoView = vi.fn()
+})
+
+// Factory for creating mock days
+const createMockDays = (count: number = 7): Day[] => {
+  return Array.from({ length: count }, (_, i) => ({
+    date: dayjs('2024-06-01').add(i, 'day'),
+    isCurrentMonth: true,
+  }))
+}
+
+// Factory for Calendar props
+const createCalendarProps = (overrides: Partial<CalendarProps> = {}): CalendarProps => ({
+  days: createMockDays(),
+  selectedDate: undefined,
+  onDateClick: vi.fn(),
+  ...overrides,
+})
+
+describe('Calendar', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should render days of week header', () => {
+      const props = createCalendarProps()
+      render(<Calendar {...props} />)
+
+      // DaysOfWeek component renders day labels
+      const dayLabels = screen.getAllByText(/daysInWeek/)
+      expect(dayLabels).toHaveLength(7)
+    })
+
+    it('should render all calendar day items', () => {
+      const days = createMockDays(7)
+      const props = createCalendarProps({ days })
+      render(<Calendar {...props} />)
+
+      const buttons = screen.getAllByRole('button')
+      expect(buttons).toHaveLength(7)
+    })
+
+    it('should accept wrapperClassName prop without errors', () => {
+      const props = createCalendarProps({ wrapperClassName: 'custom-class' })
+      const { container } = render(<Calendar {...props} />)
+
+      // Verify the component renders successfully with wrapperClassName
+      const dayLabels = screen.getAllByText(/daysInWeek/)
+      expect(dayLabels).toHaveLength(7)
+      expect(container.firstChild).toHaveClass('custom-class')
+    })
+  })
+
+  // Interaction tests
+  describe('Interactions', () => {
+    it('should call onDateClick when a day is clicked', () => {
+      const onDateClick = vi.fn()
+      const days = createMockDays(3)
+      const props = createCalendarProps({ days, onDateClick })
+      render(<Calendar {...props} />)
+
+      const dayButtons = screen.getAllByRole('button')
+      fireEvent.click(dayButtons[1])
+
+      expect(onDateClick).toHaveBeenCalledTimes(1)
+      expect(onDateClick).toHaveBeenCalledWith(days[1].date)
+    })
+  })
+
+  // Disabled dates tests
+  describe('Disabled Dates', () => {
+    it('should not call onDateClick for disabled dates', () => {
+      const onDateClick = vi.fn()
+      const days = createMockDays(3)
+      // Disable all dates
+      const getIsDateDisabled = vi.fn().mockReturnValue(true)
+      const props = createCalendarProps({ days, onDateClick, getIsDateDisabled })
+      render(<Calendar {...props} />)
+
+      const dayButtons = screen.getAllByRole('button')
+      fireEvent.click(dayButtons[0])
+
+      expect(onDateClick).not.toHaveBeenCalled()
+    })
+
+    it('should pass getIsDateDisabled to CalendarItem', () => {
+      const getIsDateDisabled = vi.fn().mockReturnValue(false)
+      const days = createMockDays(2)
+      const props = createCalendarProps({ days, getIsDateDisabled })
+      render(<Calendar {...props} />)
+
+      expect(getIsDateDisabled).toHaveBeenCalled()
+    })
+  })
+
+  // Edge cases
+  describe('Edge Cases', () => {
+    it('should render empty calendar when days array is empty', () => {
+      const props = createCalendarProps({ days: [] })
+      render(<Calendar {...props} />)
+
+      expect(screen.queryAllByRole('button')).toHaveLength(0)
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/calendar/item.spec.tsx b/web/app/components/base/date-and-time-picker/calendar/item.spec.tsx
new file mode 100644
index 0000000000..7fcfcaae1f
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/calendar/item.spec.tsx
@@ -0,0 +1,137 @@
+import type { CalendarItemProps, Day } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import dayjs from '../utils/dayjs'
+import Item from './item'
+
+const createMockDay = (overrides: Partial<Day> = {}): Day => ({
+  date: dayjs('2024-06-15'),
+  isCurrentMonth: true,
+  ...overrides,
+})
+
+const createItemProps = (overrides: Partial<CalendarItemProps> = {}): CalendarItemProps => ({
+  day: createMockDay(),
+  selectedDate: undefined,
+  onClick: vi.fn(),
+  isDisabled: false,
+  ...overrides,
+})
+
+describe('CalendarItem', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  describe('Rendering', () => {
+    it('should render the day number', () => {
+      const props = createItemProps()
+
+      render(<Item {...props} />)
+
+      expect(screen.getByRole('button', { name: '15' })).toBeInTheDocument()
+    })
+  })
+
+  describe('Visual States', () => {
+    it('should have selected styles when date matches selectedDate', () => {
+      const selectedDate = dayjs('2024-06-15')
+      const props = createItemProps({ selectedDate })
+
+      render(<Item {...props} />)
+      const button = screen.getByRole('button', { name: '15' })
+      expect(button).toHaveClass('bg-components-button-primary-bg', 'text-components-button-primary-text')
+    })
+
+    it('should not have selected styles when date does not match selectedDate', () => {
+      const selectedDate = dayjs('2024-06-16')
+      const props = createItemProps({ selectedDate })
+
+      render(<Item {...props} />)
+      const button = screen.getByRole('button', { name: '15' })
+      expect(button).not.toHaveClass('bg-components-button-primary-bg', 'text-components-button-primary-text')
+    })
+
+    it('should have different styles when day is not in current month', () => {
+      const props = createItemProps({
+        day: createMockDay({ isCurrentMonth: false }),
+      })
+
+      render(<Item {...props} />)
+      const button = screen.getByRole('button', { name: '15' })
+      expect(button).toHaveClass('text-text-quaternary')
+    })
+
+    it('should have different styles when day is in current month', () => {
+      const props = createItemProps({
+        day: createMockDay({ isCurrentMonth: true }),
+      })
+
+      render(<Item {...props} />)
+      const button = screen.getByRole('button', { name: '15' })
+      expect(button).toHaveClass('text-text-secondary')
+    })
+  })
+
+  describe('Click Behavior', () => {
+    it('should call onClick with the date when clicked', () => {
+      const onClick = vi.fn()
+      const day = createMockDay()
+      const props = createItemProps({ day, onClick })
+
+      render(<Item {...props} />)
+      fireEvent.click(screen.getByRole('button'))
+
+      expect(onClick).toHaveBeenCalledTimes(1)
+      expect(onClick).toHaveBeenCalledWith(day.date)
+    })
+
+    it('should not call onClick when isDisabled is true', () => {
+      const onClick = vi.fn()
+      const props = createItemProps({ onClick, isDisabled: true })
+
+      render(<Item {...props} />)
+      fireEvent.click(screen.getByRole('button'))
+
+      expect(onClick).not.toHaveBeenCalled()
+    })
+  })
+
+  describe('Today Indicator', () => {
+    it('should render today indicator when date is today', () => {
+      const today = dayjs()
+      const props = createItemProps({
+        day: createMockDay({ date: today }),
+      })
+
+      render(<Item {...props} />)
+
+      const button = screen.getByRole('button')
+      expect(button).toBeInTheDocument()
+      // Today's button should contain a child indicator element
+      expect(button.children.length).toBeGreaterThan(0)
+    })
+
+    it('should not render today indicator when date is not today', () => {
+      const notToday = dayjs('2020-01-01')
+      const props = createItemProps({
+        day: createMockDay({ date: notToday }),
+      })
+
+      render(<Item {...props} />)
+
+      const button = screen.getByRole('button')
+      // Non-today button should only contain the day number text, no extra children
+      expect(button.children.length).toBe(0)
+    })
+  })
+
+  describe('Edge Cases', () => {
+    it('should handle undefined selectedDate', () => {
+      const props = createItemProps({ selectedDate: undefined })
+
+      render(<Item {...props} />)
+
+      expect(screen.getByRole('button')).toBeInTheDocument()
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/common/option-list-item.spec.tsx b/web/app/components/base/date-and-time-picker/common/option-list-item.spec.tsx
new file mode 100644
index 0000000000..760ba62ddc
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/common/option-list-item.spec.tsx
@@ -0,0 +1,137 @@
+import { fireEvent, render, screen } from '@testing-library/react'
+import OptionListItem from './option-list-item'
+
+describe('OptionListItem', () => {
+  let originalScrollIntoView: Element['scrollIntoView']
+  beforeEach(() => {
+    vi.clearAllMocks()
+    originalScrollIntoView = Element.prototype.scrollIntoView
+    Element.prototype.scrollIntoView = vi.fn()
+  })
+
+  afterEach(() => {
+    Element.prototype.scrollIntoView = originalScrollIntoView
+  })
+
+  describe('Rendering', () => {
+    it('should render children content', () => {
+      render(
+        <OptionListItem isSelected={false} onClick={vi.fn()}>
+          Test Item
+        </OptionListItem>,
+      )
+
+      expect(screen.getByText('Test Item')).toBeInTheDocument()
+    })
+
+    it('should render as a list item element', () => {
+      render(
+        <OptionListItem isSelected={false} onClick={vi.fn()}>
+          Item
+        </OptionListItem>,
+      )
+
+      expect(screen.getByRole('listitem')).toBeInTheDocument()
+    })
+  })
+
+  describe('Selection State', () => {
+    it('should have selected styles when isSelected is true', () => {
+      render(
+        <OptionListItem isSelected={true} onClick={vi.fn()}>
+          Selected
+        </OptionListItem>,
+      )
+
+      const item = screen.getByRole('listitem')
+      expect(item).toHaveClass('bg-components-button-ghost-bg-hover')
+    })
+
+    it('should not have selected styles when isSelected is false', () => {
+      render(
+        <OptionListItem isSelected={false} onClick={vi.fn()}>
+          Not Selected
+        </OptionListItem>,
+      )
+
+      const item = screen.getByRole('listitem')
+      expect(item).not.toHaveClass('bg-components-button-ghost-bg-hover')
+    })
+  })
+
+  describe('Auto-Scroll', () => {
+    it('should scroll into view on mount when isSelected is true', () => {
+      render(
+        <OptionListItem isSelected={true} onClick={vi.fn()}>
+          Selected
+        </OptionListItem>,
+      )
+
+      expect(Element.prototype.scrollIntoView).toHaveBeenCalledWith({ behavior: 'instant' })
+    })
+
+    it('should not scroll into view on mount when isSelected is false', () => {
+      render(
+        <OptionListItem isSelected={false} onClick={vi.fn()}>
+          Not Selected
+        </OptionListItem>,
+      )
+
+      expect(Element.prototype.scrollIntoView).not.toHaveBeenCalled()
+    })
+
+    it('should not scroll into view on mount when noAutoScroll is true', () => {
+      render(
+        <OptionListItem isSelected={true} noAutoScroll onClick={vi.fn()}>
+          No Scroll
+        </OptionListItem>,
+      )
+
+      expect(Element.prototype.scrollIntoView).not.toHaveBeenCalled()
+    })
+  })
+
+  describe('Click Behavior', () => {
+    it('should call onClick when clicked', () => {
+      const handleClick = vi.fn()
+
+      render(
+        <OptionListItem isSelected={false} onClick={handleClick}>
+          Clickable
+        </OptionListItem>,
+      )
+      fireEvent.click(screen.getByRole('listitem'))
+
+      expect(handleClick).toHaveBeenCalledTimes(1)
+    })
+
+    it('should scroll into view with smooth behavior on click', () => {
+      render(
+        <OptionListItem isSelected={false} onClick={vi.fn()}>
+          Item
+        </OptionListItem>,
+      )
+      fireEvent.click(screen.getByRole('listitem'))
+
+      expect(Element.prototype.scrollIntoView).toHaveBeenCalledWith({ behavior: 'smooth' })
+    })
+  })
+
+  describe('Edge Cases', () => {
+    it('should handle rapid clicks without errors', () => {
+      const handleClick = vi.fn()
+      render(
+        <OptionListItem isSelected={false} onClick={handleClick}>
+          Rapid Click
+        </OptionListItem>,
+      )
+
+      const item = screen.getByRole('listitem')
+      fireEvent.click(item)
+      fireEvent.click(item)
+      fireEvent.click(item)
+
+      expect(handleClick).toHaveBeenCalledTimes(3)
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/date-picker/footer.spec.tsx b/web/app/components/base/date-and-time-picker/date-picker/footer.spec.tsx
new file mode 100644
index 0000000000..c164044484
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/date-picker/footer.spec.tsx
@@ -0,0 +1,97 @@
+import type { DatePickerFooterProps } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import { ViewType } from '../types'
+import Footer from './footer'
+
+// Factory for Footer props
+const createFooterProps = (overrides: Partial<DatePickerFooterProps> = {}): DatePickerFooterProps => ({
+  needTimePicker: true,
+  displayTime: '02:30 PM',
+  view: ViewType.date,
+  handleClickTimePicker: vi.fn(),
+  handleSelectCurrentDate: vi.fn(),
+  handleConfirmDate: vi.fn(),
+  ...overrides,
+})
+
+describe('DatePicker Footer', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should render Now button and confirm button', () => {
+      const props = createFooterProps()
+      render(<Footer {...props} />)
+
+      expect(screen.getByText(/operation\.now/)).toBeInTheDocument()
+      expect(screen.getByText(/operation\.ok/)).toBeInTheDocument()
+    })
+
+    it('should show time picker button when needTimePicker is true', () => {
+      const props = createFooterProps({ needTimePicker: true, displayTime: '02:30 PM' })
+      render(<Footer {...props} />)
+
+      expect(screen.getByText('02:30 PM')).toBeInTheDocument()
+    })
+
+    it('should not show time picker button when needTimePicker is false', () => {
+      const props = createFooterProps({ needTimePicker: false })
+      render(<Footer {...props} />)
+
+      expect(screen.queryByText('02:30 PM')).not.toBeInTheDocument()
+    })
+  })
+
+  // View-dependent rendering tests
+  describe('View States', () => {
+    it('should show display time when view is date', () => {
+      const props = createFooterProps({ view: ViewType.date, displayTime: '10:00 AM' })
+      render(<Footer {...props} />)
+
+      expect(screen.getByText('10:00 AM')).toBeInTheDocument()
+    })
+
+    it('should show pickDate text when view is time', () => {
+      const props = createFooterProps({ view: ViewType.time })
+      render(<Footer {...props} />)
+
+      expect(screen.getByText(/operation\.pickDate/)).toBeInTheDocument()
+    })
+  })
+
+  // Interaction tests
+  describe('Interactions', () => {
+    it('should call handleClickTimePicker when time picker button is clicked', () => {
+      const handleClickTimePicker = vi.fn()
+      const props = createFooterProps({ handleClickTimePicker })
+      render(<Footer {...props} />)
+
+      // Click the time picker toggle button (has the time display)
+      fireEvent.click(screen.getByText('02:30 PM'))
+
+      expect(handleClickTimePicker).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call handleSelectCurrentDate when Now button is clicked', () => {
+      const handleSelectCurrentDate = vi.fn()
+      const props = createFooterProps({ handleSelectCurrentDate })
+      render(<Footer {...props} />)
+
+      fireEvent.click(screen.getByText(/operation\.now/))
+
+      expect(handleSelectCurrentDate).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call handleConfirmDate when OK button is clicked', () => {
+      const handleConfirmDate = vi.fn()
+      const props = createFooterProps({ handleConfirmDate })
+      render(<Footer {...props} />)
+
+      fireEvent.click(screen.getByText(/operation\.ok/))
+
+      expect(handleConfirmDate).toHaveBeenCalledTimes(1)
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/date-picker/header.spec.tsx b/web/app/components/base/date-and-time-picker/date-picker/header.spec.tsx
new file mode 100644
index 0000000000..353b662eeb
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/date-picker/header.spec.tsx
@@ -0,0 +1,78 @@
+import type { DatePickerHeaderProps } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import dayjs from '../utils/dayjs'
+import Header from './header'
+
+// Factory for Header props
+const createHeaderProps = (overrides: Partial<DatePickerHeaderProps> = {}): DatePickerHeaderProps => ({
+  handleOpenYearMonthPicker: vi.fn(),
+  currentDate: dayjs('2024-06-15'),
+  onClickNextMonth: vi.fn(),
+  onClickPrevMonth: vi.fn(),
+  ...overrides,
+})
+
+describe('DatePicker Header', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should render month and year display', () => {
+      const props = createHeaderProps({ currentDate: dayjs('2024-06-15') })
+      render(<Header {...props} />)
+
+      // The useMonths hook returns translated keys; check for year
+      expect(screen.getByText(/2024/)).toBeInTheDocument()
+    })
+
+    it('should render navigation buttons', () => {
+      const props = createHeaderProps()
+      render(<Header {...props} />)
+
+      // There are 3 buttons: month/year display, prev, next
+      const buttons = screen.getAllByRole('button')
+      expect(buttons).toHaveLength(3)
+    })
+  })
+
+  // Interaction tests
+  describe('Interactions', () => {
+    it('should call handleOpenYearMonthPicker when month/year button is clicked', () => {
+      const handleOpenYearMonthPicker = vi.fn()
+      const props = createHeaderProps({ handleOpenYearMonthPicker })
+      render(<Header {...props} />)
+
+      // First button is the month/year display
+      const buttons = screen.getAllByRole('button')
+      fireEvent.click(buttons[0])
+
+      expect(handleOpenYearMonthPicker).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call onClickPrevMonth when previous button is clicked', () => {
+      const onClickPrevMonth = vi.fn()
+      const props = createHeaderProps({ onClickPrevMonth })
+      render(<Header {...props} />)
+
+      // Second button is prev month
+      const buttons = screen.getAllByRole('button')
+      fireEvent.click(buttons[1])
+
+      expect(onClickPrevMonth).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call onClickNextMonth when next button is clicked', () => {
+      const onClickNextMonth = vi.fn()
+      const props = createHeaderProps({ onClickNextMonth })
+      render(<Header {...props} />)
+
+      // Third button is next month
+      const buttons = screen.getAllByRole('button')
+      fireEvent.click(buttons[2])
+
+      expect(onClickNextMonth).toHaveBeenCalledTimes(1)
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/date-picker/index.spec.tsx b/web/app/components/base/date-and-time-picker/date-picker/index.spec.tsx
new file mode 100644
index 0000000000..26ca3db1e1
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/date-picker/index.spec.tsx
@@ -0,0 +1,616 @@
+import type { DatePickerProps } from '../types'
+import { act, fireEvent, render, screen, within } from '@testing-library/react'
+import dayjs from '../utils/dayjs'
+import DatePicker from './index'
+
+// Mock scrollIntoView
+beforeAll(() => {
+  Element.prototype.scrollIntoView = vi.fn()
+})
+
+// Factory for DatePicker props
+const createDatePickerProps = (overrides: Partial<DatePickerProps> = {}): DatePickerProps => ({
+  value: undefined,
+  onChange: vi.fn(),
+  onClear: vi.fn(),
+  ...overrides,
+})
+
+// Helper to open the picker
+const openPicker = () => {
+  const input = screen.getByRole('textbox')
+  fireEvent.click(input)
+}
+
+describe('DatePicker', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should render with default placeholder', () => {
+      const props = createDatePickerProps()
+      render(<DatePicker {...props} />)
+
+      expect(screen.getByRole('textbox')).toBeInTheDocument()
+    })
+
+    it('should render with custom placeholder', () => {
+      const props = createDatePickerProps({ placeholder: 'Select date' })
+      render(<DatePicker {...props} />)
+
+      expect(screen.getByRole('textbox')).toHaveAttribute('placeholder', 'Select date')
+    })
+
+    it('should display formatted date value when value is provided', () => {
+      const value = dayjs('2024-06-15T14:30:00')
+      const props = createDatePickerProps({ value })
+      render(<DatePicker {...props} />)
+
+      expect(screen.getByRole('textbox').getAttribute('value')).not.toBe('')
+    })
+
+    it('should render with empty value when no value is provided', () => {
+      const props = createDatePickerProps()
+      render(<DatePicker {...props} />)
+
+      expect(screen.getByRole('textbox')).toHaveValue('')
+    })
+
+    it('should normalize value with timezone applied', () => {
+      const value = dayjs('2024-06-15T14:30:00')
+      const props = createDatePickerProps({ value, timezone: 'America/New_York' })
+      render(<DatePicker {...props} />)
+
+      expect(screen.getByRole('textbox').getAttribute('value')).not.toBe('')
+    })
+  })
+
+  // Open/close behavior
+  describe('Open/Close Behavior', () => {
+    it('should open the picker when trigger is clicked', () => {
+      const props = createDatePickerProps()
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      expect(screen.getAllByText(/daysInWeek/).length).toBeGreaterThan(0)
+    })
+
+    it('should close when trigger is clicked while open', () => {
+      const props = createDatePickerProps()
+      render(<DatePicker {...props} />)
+
+      openPicker()
+      openPicker() // second click closes
+
+      expect(screen.getByRole('textbox')).toBeInTheDocument()
+    })
+
+    it('should restore selected date from value when reopening', () => {
+      const value = dayjs('2024-06-15')
+      const props = createDatePickerProps({ value })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Calendar should be showing June 2024
+      expect(screen.getByText(/2024/)).toBeInTheDocument()
+    })
+
+    it('should close when clicking outside the container', () => {
+      const props = createDatePickerProps()
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Simulate a mousedown event outside the container
+      act(() => {
+        document.dispatchEvent(new MouseEvent('mousedown', { bubbles: true }))
+      })
+
+      // The picker should now be closed - input shows its value
+      expect(screen.getByRole('textbox')).toBeInTheDocument()
+    })
+  })
+
+  // Time Picker Integration
+  describe('Time Picker Integration', () => {
+    it('should show time display in footer when needTimePicker is true', () => {
+      const props = createDatePickerProps({ needTimePicker: true })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      expect(screen.getByText('--:-- --')).toBeInTheDocument()
+    })
+
+    it('should not show time toggle when needTimePicker is false', () => {
+      const props = createDatePickerProps({ needTimePicker: false })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      expect(screen.queryByText('--:-- --')).not.toBeInTheDocument()
+    })
+
+    it('should switch to time view when time picker button is clicked', () => {
+      const props = createDatePickerProps({ needTimePicker: true })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Click the time display button to switch to time view
+      fireEvent.click(screen.getByText('--:-- --'))
+
+      // In time view, the "pickDate" text should appear instead of the time
+      expect(screen.getByText(/operation\.pickDate/)).toBeInTheDocument()
+    })
+
+    it('should switch back to date view when pickDate is clicked in time view', () => {
+      const props = createDatePickerProps({ needTimePicker: true })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Switch to time view
+      fireEvent.click(screen.getByText('--:-- --'))
+      // Switch back to date view
+      fireEvent.click(screen.getByText(/operation\.pickDate/))
+
+      // Days of week should be visible again
+      expect(screen.getAllByText(/daysInWeek/).length).toBeGreaterThan(0)
+    })
+
+    it('should render time picker options in time view', () => {
+      const props = createDatePickerProps({ needTimePicker: true, value: dayjs('2024-06-15T14:30:00') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Switch to time view
+      fireEvent.click(screen.getByText(/\d{2}:\d{2}\s(AM|PM)/))
+
+      // Should show AM/PM options (TimePickerOptions renders these)
+      expect(screen.getByText('AM')).toBeInTheDocument()
+      expect(screen.getByText('PM')).toBeInTheDocument()
+    })
+
+    it('should update selected time when hour is selected in time view', () => {
+      const props = createDatePickerProps({ needTimePicker: true, value: dayjs('2024-06-15T14:30:00') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Switch to time view
+      fireEvent.click(screen.getByText(/\d{2}:\d{2}\s(AM|PM)/))
+
+      // Click hour "05" from the time options
+      const allLists = screen.getAllByRole('list')
+      const hourItems = within(allLists[0]).getAllByRole('listitem')
+      fireEvent.click(hourItems[4])
+
+      // The picker should still be in time view
+      expect(screen.getByText(/operation\.pickDate/)).toBeInTheDocument()
+    })
+
+    it('should update selected time when minute is selected in time view', () => {
+      const props = createDatePickerProps({ needTimePicker: true, value: dayjs('2024-06-15T14:30:00') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Switch to time view
+      fireEvent.click(screen.getByText(/\d{2}:\d{2}\s(AM|PM)/))
+
+      // Click minute "45" from the time options
+      const allLists = screen.getAllByRole('list')
+      const minuteItems = within(allLists[1]).getAllByRole('listitem')
+      fireEvent.click(minuteItems[45])
+
+      expect(screen.getByText(/operation\.pickDate/)).toBeInTheDocument()
+    })
+
+    it('should update selected time when period is changed in time view', () => {
+      const props = createDatePickerProps({ needTimePicker: true, value: dayjs('2024-06-15T14:30:00') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Switch to time view
+      fireEvent.click(screen.getByText(/\d{2}:\d{2}\s(AM|PM)/))
+
+      // Click AM to switch period
+      fireEvent.click(screen.getByText('AM'))
+
+      expect(screen.getByText(/operation\.pickDate/)).toBeInTheDocument()
+    })
+
+    it('should update time when no selectedDate exists and hour is selected', () => {
+      const props = createDatePickerProps({ needTimePicker: true })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Switch to time view (click on the "--:-- --" text)
+      fireEvent.click(screen.getByText('--:-- --'))
+
+      // Click hour "03" from the time options
+      const allLists = screen.getAllByRole('list')
+      const hourItems = within(allLists[0]).getAllByRole('listitem')
+      fireEvent.click(hourItems[2])
+
+      expect(screen.getByText(/operation\.pickDate/)).toBeInTheDocument()
+    })
+  })
+
+  // Date selection
+  describe('Date Selection', () => {
+    it('should call onChange when Now button is clicked', () => {
+      const onChange = vi.fn()
+      const props = createDatePickerProps({ onChange })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+      fireEvent.click(screen.getByText(/operation\.now/))
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call onChange when OK button is clicked with a value', () => {
+      const onChange = vi.fn()
+      const props = createDatePickerProps({ onChange, value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+      fireEvent.click(screen.getByText(/operation\.ok/))
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+    })
+
+    it('should select a calendar day when clicked', () => {
+      const onChange = vi.fn()
+      const props = createDatePickerProps({ onChange, value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Click on a day in the calendar - day "20"
+      const dayButton = screen.getByRole('button', { name: '20' })
+      fireEvent.click(dayButton)
+
+      // The date should now appear in the header/display
+      expect(screen.getByRole('textbox')).toBeInTheDocument()
+    })
+
+    it('should immediately confirm when noConfirm is true and a date is clicked', () => {
+      const onChange = vi.fn()
+      const props = createDatePickerProps({ onChange, noConfirm: true, value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Click on a day
+      const dayButton = screen.getByRole('button', { name: '20' })
+      fireEvent.click(dayButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call onChange with undefined when OK is clicked without a selected date', () => {
+      const onChange = vi.fn()
+      const props = createDatePickerProps({ onChange })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Clear selected date then confirm
+      fireEvent.click(screen.getByText(/operation\.ok/))
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+    })
+  })
+
+  // Clear behavior
+  describe('Clear Behavior', () => {
+    it('should call onClear when clear is clicked while picker is closed', () => {
+      const onClear = vi.fn()
+      const renderTrigger = vi.fn(({ handleClear }) => (
+        <button data-testid="clear-trigger" onClick={handleClear}>
+          Clear
+        </button>
+      ))
+      const props = createDatePickerProps({
+        value: dayjs('2024-06-15'),
+        onClear,
+        renderTrigger,
+      })
+      render(<DatePicker {...props} />)
+
+      fireEvent.click(screen.getByTestId('clear-trigger'))
+
+      expect(onClear).toHaveBeenCalledTimes(1)
+    })
+
+    it('should clear selected date without calling onClear when picker is open', () => {
+      const onClear = vi.fn()
+      const onChange = vi.fn()
+      const renderTrigger = vi.fn(({ handleClickTrigger, handleClear }) => (
+        <div>
+          <button data-testid="open-trigger" onClick={handleClickTrigger}>
+            Open
+          </button>
+          <button data-testid="clear-trigger" onClick={handleClear}>
+            Clear
+          </button>
+        </div>
+      ))
+      const props = createDatePickerProps({
+        value: dayjs('2024-06-15'),
+        onClear,
+        onChange,
+        renderTrigger,
+      })
+      render(<DatePicker {...props} />)
+
+      fireEvent.click(screen.getByTestId('open-trigger'))
+      fireEvent.click(screen.getByTestId('clear-trigger'))
+      fireEvent.click(screen.getByText(/operation\.ok/))
+
+      expect(onClear).not.toHaveBeenCalled()
+      expect(onChange).toHaveBeenCalledWith(undefined)
+    })
+  })
+
+  // Month navigation
+  describe('Month Navigation', () => {
+    it('should navigate to next month when next arrow is clicked', () => {
+      const props = createDatePickerProps({ value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // Find navigation buttons in the header
+      const allButtons = screen.getAllByRole('button')
+      // The header has: month/year button, prev button, next button
+      // Then calendar days are also buttons. We need the 3rd button (next month).
+      // Header buttons come first in DOM order.
+      fireEvent.click(allButtons[2]) // next month button
+
+      expect(screen.getAllByRole('button').length).toBeGreaterThan(0)
+    })
+
+    it('should navigate to previous month when prev arrow is clicked', () => {
+      const props = createDatePickerProps({ value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      const allButtons = screen.getAllByRole('button')
+      fireEvent.click(allButtons[1]) // prev month button
+
+      expect(screen.getAllByRole('button').length).toBeGreaterThan(0)
+    })
+  })
+
+  // Year/Month picker
+  describe('Year/Month Picker', () => {
+    it('should open year/month picker when month/year header is clicked', () => {
+      const props = createDatePickerProps({ value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      const headerButton = screen.getByText(/2024/)
+      fireEvent.click(headerButton)
+
+      // Cancel button visible in year/month picker footer
+      expect(screen.getByText(/operation\.cancel/)).toBeInTheDocument()
+    })
+
+    it('should close year/month picker when cancel is clicked', () => {
+      const props = createDatePickerProps({ value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+      fireEvent.click(screen.getByText(/2024/))
+
+      // Cancel
+      fireEvent.click(screen.getByText(/operation\.cancel/))
+
+      // Should be back to date view with days of week
+      expect(screen.getAllByText(/daysInWeek/).length).toBeGreaterThan(0)
+    })
+
+    it('should confirm year/month selection when OK is clicked', () => {
+      const props = createDatePickerProps({ value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+      fireEvent.click(screen.getByText(/2024/))
+
+      // Select a different year
+      fireEvent.click(screen.getByText('2023'))
+
+      // Confirm - click the last OK button (year/month footer)
+      const okButtons = screen.getAllByText(/operation\.ok/)
+      fireEvent.click(okButtons[okButtons.length - 1])
+
+      // Should return to date view
+      expect(screen.getAllByText(/daysInWeek/).length).toBeGreaterThan(0)
+    })
+
+    it('should close year/month picker by clicking header button', () => {
+      const props = createDatePickerProps({ value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+      // Open year/month picker
+      fireEvent.click(screen.getByText(/2024/))
+
+      // The header in year/month view shows selected month/year with an up arrow
+      // Clicking it closes the year/month picker
+      const headerButtons = screen.getAllByRole('button')
+      fireEvent.click(headerButtons[0]) // First button in year/month view is the header
+
+      // Should return to date view
+      expect(screen.getAllByText(/daysInWeek/).length).toBeGreaterThan(0)
+    })
+
+    it('should update month selection in year/month picker', () => {
+      const props = createDatePickerProps({ value: dayjs('2024-06-15') })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+      fireEvent.click(screen.getByText(/2024/))
+
+      // Select a different month using RTL queries
+      const allLists = screen.getAllByRole('list')
+      const monthItems = within(allLists[0]).getAllByRole('listitem')
+      fireEvent.click(monthItems[0])
+
+      // Confirm the selection - click the last OK button (year/month footer)
+      const okButtons = screen.getAllByText(/operation\.ok/)
+      fireEvent.click(okButtons[okButtons.length - 1])
+
+      // Should return to date view
+      expect(screen.getAllByText(/daysInWeek/).length).toBeGreaterThan(0)
+    })
+  })
+
+  // noConfirm mode
+  describe('noConfirm Mode', () => {
+    it('should not show footer when noConfirm is true', () => {
+      const props = createDatePickerProps({ noConfirm: true })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      expect(screen.queryByText(/operation\.ok/)).not.toBeInTheDocument()
+    })
+  })
+
+  // Custom trigger
+  describe('Custom Trigger', () => {
+    it('should use renderTrigger when provided', () => {
+      const renderTrigger = vi.fn(({ handleClickTrigger }) => (
+        <button data-testid="custom-trigger" onClick={handleClickTrigger}>
+          Custom
+        </button>
+      ))
+
+      const props = createDatePickerProps({ renderTrigger })
+      render(<DatePicker {...props} />)
+
+      expect(screen.getByTestId('custom-trigger')).toBeInTheDocument()
+    })
+
+    it('should open picker when custom trigger is clicked', () => {
+      const renderTrigger = vi.fn(({ handleClickTrigger }) => (
+        <button data-testid="custom-trigger" onClick={handleClickTrigger}>
+          Custom
+        </button>
+      ))
+
+      const props = createDatePickerProps({ renderTrigger })
+      render(<DatePicker {...props} />)
+
+      fireEvent.click(screen.getByTestId('custom-trigger'))
+
+      expect(screen.getAllByText(/daysInWeek/).length).toBeGreaterThan(0)
+    })
+  })
+
+  // Disabled dates
+  describe('Disabled Dates', () => {
+    it('should pass getIsDateDisabled to calendar', () => {
+      const getIsDateDisabled = vi.fn().mockReturnValue(false)
+      const props = createDatePickerProps({
+        value: dayjs('2024-06-15'),
+        getIsDateDisabled,
+      })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      expect(getIsDateDisabled).toHaveBeenCalled()
+    })
+  })
+
+  // Timezone
+  describe('Timezone', () => {
+    it('should render with timezone', () => {
+      const props = createDatePickerProps({
+        value: dayjs('2024-06-15'),
+        timezone: 'UTC',
+      })
+      render(<DatePicker {...props} />)
+
+      expect(screen.getByRole('textbox')).toBeInTheDocument()
+    })
+
+    it('should call onChange when timezone changes with a value', () => {
+      const onChange = vi.fn()
+      const props = createDatePickerProps({
+        value: dayjs('2024-06-15T14:30:00'),
+        timezone: 'UTC',
+        onChange,
+      })
+      const { rerender } = render(<DatePicker {...props} />)
+
+      // Change timezone
+      rerender(<DatePicker {...props} timezone="America/New_York" />)
+
+      expect(onChange).toHaveBeenCalled()
+    })
+
+    it('should update currentDate when timezone changes without a value', () => {
+      const onChange = vi.fn()
+      const props = createDatePickerProps({
+        timezone: 'UTC',
+        onChange,
+      })
+      const { rerender } = render(<DatePicker {...props} />)
+
+      // Change timezone with no value
+      rerender(<DatePicker {...props} timezone="America/New_York" />)
+
+      // onChange should NOT be called when there is no value
+      expect(onChange).not.toHaveBeenCalled()
+    })
+
+    it('should update selectedDate when timezone changes and value is present', () => {
+      const onChange = vi.fn()
+      const value = dayjs('2024-06-15T14:30:00')
+      const props = createDatePickerProps({
+        value,
+        timezone: 'UTC',
+        onChange,
+      })
+      const { rerender } = render(<DatePicker {...props} />)
+
+      // Change timezone
+      rerender(<DatePicker {...props} timezone="Asia/Tokyo" />)
+
+      // Should have been called with the new timezone-adjusted value
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(emitted.isValid()).toBe(true)
+    })
+  })
+
+  // Display time when selected date exists
+  describe('Time Display', () => {
+    it('should show formatted time when selectedDate exists', () => {
+      const value = dayjs('2024-06-15T14:30:00')
+      const props = createDatePickerProps({ value, needTimePicker: true })
+      render(<DatePicker {...props} />)
+
+      openPicker()
+
+      // The footer should show the time from selectedDate (02:30 PM)
+      expect(screen.getByText(/\d{2}:\d{2}\s(AM|PM)/)).toBeInTheDocument()
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/hooks.spec.ts b/web/app/components/base/date-and-time-picker/hooks.spec.ts
new file mode 100644
index 0000000000..c3675b9d84
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/hooks.spec.ts
@@ -0,0 +1,94 @@
+import { renderHook } from '@testing-library/react'
+import { useDaysOfWeek, useMonths, useTimeOptions, useYearOptions } from './hooks'
+import { Period } from './types'
+import dayjs from './utils/dayjs'
+
+describe('date-and-time-picker hooks', () => {
+  // Tests for useDaysOfWeek hook
+  describe('useDaysOfWeek', () => {
+    it('should return 7 days of the week', () => {
+      const { result } = renderHook(() => useDaysOfWeek())
+
+      expect(result.current).toHaveLength(7)
+    })
+
+    it('should return translated day keys with namespace prefix', () => {
+      const { result } = renderHook(() => useDaysOfWeek())
+
+      // Global i18n mock returns "time.daysInWeek.<day>" format
+      expect(result.current[0]).toContain('daysInWeek.Sun')
+      expect(result.current[6]).toContain('daysInWeek.Sat')
+    })
+  })
+
+  // Tests for useMonths hook
+  describe('useMonths', () => {
+    it('should return 12 months', () => {
+      const { result } = renderHook(() => useMonths())
+
+      expect(result.current).toHaveLength(12)
+    })
+
+    it('should return translated month keys with namespace prefix', () => {
+      const { result } = renderHook(() => useMonths())
+
+      expect(result.current[0]).toContain('months.January')
+      expect(result.current[11]).toContain('months.December')
+    })
+  })
+
+  // Tests for useYearOptions hook
+  describe('useYearOptions', () => {
+    it('should return 200 year options', () => {
+      const { result } = renderHook(() => useYearOptions())
+
+      expect(result.current).toHaveLength(200)
+    })
+
+    it('should center around the current year', () => {
+      const { result } = renderHook(() => useYearOptions())
+      const currentYear = dayjs().year()
+
+      expect(result.current).toContain(currentYear)
+      // First year should be currentYear - 50 (YEAR_RANGE/2 = 50)
+      expect(result.current[0]).toBe(currentYear - 50)
+      // Last year should be currentYear + 149
+      expect(result.current[199]).toBe(currentYear + 149)
+    })
+  })
+
+  // Tests for useTimeOptions hook
+  describe('useTimeOptions', () => {
+    it('should return 12 hour options', () => {
+      const { result } = renderHook(() => useTimeOptions())
+
+      expect(result.current.hourOptions).toHaveLength(12)
+    })
+
+    it('should return hours from 01 to 12 zero-padded', () => {
+      const { result } = renderHook(() => useTimeOptions())
+
+      expect(result.current.hourOptions[0]).toBe('01')
+      expect(result.current.hourOptions[11]).toBe('12')
+    })
+
+    it('should return 60 minute options', () => {
+      const { result } = renderHook(() => useTimeOptions())
+
+      expect(result.current.minuteOptions).toHaveLength(60)
+    })
+
+    it('should return minutes from 00 to 59 zero-padded', () => {
+      const { result } = renderHook(() => useTimeOptions())
+
+      expect(result.current.minuteOptions[0]).toBe('00')
+      expect(result.current.minuteOptions[59]).toBe('59')
+    })
+
+    it('should return AM and PM period options', () => {
+      const { result } = renderHook(() => useTimeOptions())
+
+      expect(result.current.periodOptions).toEqual([Period.AM, Period.PM])
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/time-picker/footer.spec.tsx b/web/app/components/base/date-and-time-picker/time-picker/footer.spec.tsx
new file mode 100644
index 0000000000..a11e6b94d6
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/time-picker/footer.spec.tsx
@@ -0,0 +1,50 @@
+import type { TimePickerFooterProps } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import Footer from './footer'
+
+// Factory for TimePickerFooter props
+const createFooterProps = (overrides: Partial<TimePickerFooterProps> = {}): TimePickerFooterProps => ({
+  handleSelectCurrentTime: vi.fn(),
+  handleConfirm: vi.fn(),
+  ...overrides,
+})
+
+describe('TimePicker Footer', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should render Now and OK buttons', () => {
+      const props = createFooterProps()
+      render(<Footer {...props} />)
+
+      expect(screen.getByText(/operation\.now/)).toBeInTheDocument()
+      expect(screen.getByText(/operation\.ok/)).toBeInTheDocument()
+    })
+  })
+
+  // Interaction tests
+  describe('Interactions', () => {
+    it('should call handleSelectCurrentTime when Now button is clicked', () => {
+      const handleSelectCurrentTime = vi.fn()
+      const props = createFooterProps({ handleSelectCurrentTime })
+      render(<Footer {...props} />)
+
+      fireEvent.click(screen.getByText(/operation\.now/))
+
+      expect(handleSelectCurrentTime).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call handleConfirm when OK button is clicked', () => {
+      const handleConfirm = vi.fn()
+      const props = createFooterProps({ handleConfirm })
+      render(<Footer {...props} />)
+
+      fireEvent.click(screen.getByText(/operation\.ok/))
+
+      expect(handleConfirm).toHaveBeenCalledTimes(1)
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/time-picker/header.spec.tsx b/web/app/components/base/date-and-time-picker/time-picker/header.spec.tsx
new file mode 100644
index 0000000000..7f9872ff0f
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/time-picker/header.spec.tsx
@@ -0,0 +1,30 @@
+import { render, screen } from '@testing-library/react'
+import Header from './header'
+
+describe('TimePicker Header', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should render default title when no title prop is provided', () => {
+      render(<Header />)
+
+      // Global i18n mock returns the key with namespace prefix
+      expect(screen.getByText(/title\.pickTime/)).toBeInTheDocument()
+    })
+
+    it('should render custom title when title prop is provided', () => {
+      render(<Header title="Custom Title" />)
+
+      expect(screen.getByText('Custom Title')).toBeInTheDocument()
+    })
+
+    it('should not render default title when custom title is provided', () => {
+      render(<Header title="Custom Title" />)
+
+      expect(screen.queryByText(/title\.pickTime/)).not.toBeInTheDocument()
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/time-picker/index.spec.tsx b/web/app/components/base/date-and-time-picker/time-picker/index.spec.tsx
index 47fbf9ae32..ee4e08f988 100644
--- a/web/app/components/base/date-and-time-picker/time-picker/index.spec.tsx
+++ b/web/app/components/base/date-and-time-picker/time-picker/index.spec.tsx
@@ -1,42 +1,12 @@
 import type { TimePickerProps } from '../types'
-import { fireEvent, render, screen } from '@testing-library/react'
-import * as React from 'react'
+import { fireEvent, render, screen, within } from '@testing-library/react'
 import dayjs, { isDayjsObject } from '../utils/dayjs'
 import TimePicker from './index'
 
-vi.mock('react-i18next', () => ({
-  useTranslation: () => ({
-    t: (key: string, options?: { ns?: string }) => {
-      if (key === 'defaultPlaceholder')
-        return 'Pick a time...'
-      if (key === 'operation.now')
-        return 'Now'
-      if (key === 'operation.ok')
-        return 'OK'
-      if (key === 'operation.clear')
-        return 'Clear'
-      const prefix = options?.ns ? `${options.ns}.` : ''
-      return `${prefix}${key}`
-    },
-  }),
-}))
-
-vi.mock('@/app/components/base/portal-to-follow-elem', () => ({
-  PortalToFollowElem: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
-  PortalToFollowElemTrigger: ({ children, onClick }: { children: React.ReactNode, onClick: (e: React.MouseEvent) => void }) => (
-    <div onClick={onClick}>{children}</div>
-  ),
-  PortalToFollowElemContent: ({ children }: { children: React.ReactNode }) => (
-    <div data-testid="timepicker-content">{children}</div>
-  ),
-}))
-
-vi.mock('./options', () => ({
-  default: () => <div data-testid="time-options" />,
-}))
-vi.mock('./header', () => ({
-  default: () => <div data-testid="time-header" />,
-}))
+// Mock scrollIntoView since jsdom doesn't implement it
+beforeAll(() => {
+  Element.prototype.scrollIntoView = vi.fn()
+})
 
 describe('TimePicker', () => {
   const baseProps: Pick<TimePickerProps, 'onChange' | 'onClear' | 'value'> = {
@@ -73,10 +43,10 @@ describe('TimePicker', () => {
     const input = screen.getByRole('textbox')
     fireEvent.click(input)
 
-    const clearButton = screen.getByRole('button', { name: /clear/i })
+    const clearButton = screen.getByRole('button', { name: /operation\.clear/i })
     fireEvent.click(clearButton)
 
-    const confirmButton = screen.getByRole('button', { name: 'OK' })
+    const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
     fireEvent.click(confirmButton)
 
     expect(baseProps.onChange).toHaveBeenCalledTimes(1)
@@ -94,7 +64,10 @@ describe('TimePicker', () => {
       />,
     )
 
-    const nowButton = screen.getByRole('button', { name: 'Now' })
+    // Open the picker first to access content
+    fireEvent.click(screen.getByRole('textbox'))
+
+    const nowButton = screen.getByRole('button', { name: /operation\.now/i })
     fireEvent.click(nowButton)
 
     expect(onChange).toHaveBeenCalledTimes(1)
@@ -103,6 +76,601 @@ describe('TimePicker', () => {
     expect(emitted?.utcOffset()).toBe(dayjs().tz('America/New_York').utcOffset())
   })
 
+  // Opening and closing behavior tests
+  describe('Open/Close Behavior', () => {
+    it('should show placeholder when no value is provided', () => {
+      render(<TimePicker {...baseProps} />)
+
+      const input = screen.getByRole('textbox')
+      expect(input).toHaveAttribute('placeholder', expect.stringMatching(/defaultPlaceholder/i))
+    })
+
+    it('should toggle open state when trigger is clicked', () => {
+      render(<TimePicker {...baseProps} value="10:00 AM" timezone="UTC" />)
+
+      const input = screen.getByRole('textbox')
+      // Open
+      fireEvent.click(input)
+      expect(input).toHaveValue('')
+
+      // Close by clicking again
+      fireEvent.click(input)
+      expect(input).toHaveValue('10:00 AM')
+    })
+
+    it('should call onClear when clear is clicked while picker is closed', () => {
+      const onClear = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onClear={onClear}
+          value="10:00 AM"
+          timezone="UTC"
+        />,
+      )
+
+      const clearButton = screen.getByRole('button', { name: /operation\.clear/i })
+      fireEvent.click(clearButton)
+
+      expect(onClear).toHaveBeenCalledTimes(1)
+    })
+
+    it('should not call onClear when clear is clicked while picker is open', () => {
+      const onClear = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onClear={onClear}
+          value="10:00 AM"
+          timezone="UTC"
+        />,
+      )
+
+      // Open picker first
+      fireEvent.click(screen.getByRole('textbox'))
+      // Then clear
+      const clearButton = screen.getByRole('button', { name: /operation\.clear/i })
+      fireEvent.click(clearButton)
+
+      expect(onClear).not.toHaveBeenCalled()
+    })
+
+    it('should register click outside listener on mount', () => {
+      const addEventSpy = vi.spyOn(document, 'addEventListener')
+      render(<TimePicker {...baseProps} value="10:00 AM" timezone="UTC" />)
+
+      expect(addEventSpy).toHaveBeenCalledWith('mousedown', expect.any(Function))
+      addEventSpy.mockRestore()
+    })
+
+    it('should sync selectedTime from value when opening with stale state', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value="10:00 AM"
+          timezone="UTC"
+        />,
+      )
+
+      const input = screen.getByRole('textbox')
+      // Open - this triggers handleClickTrigger which syncs selectedTime from value
+      fireEvent.click(input)
+
+      // Confirm to verify selectedTime was synced from value prop ("10:00 AM")
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+      expect(onChange).toHaveBeenCalledTimes(1)
+
+      const emitted = onChange.mock.calls[0][0]
+      expect(isDayjsObject(emitted)).toBe(true)
+      expect(emitted.hour()).toBe(10)
+      expect(emitted.minute()).toBe(0)
+    })
+
+    it('should resync selectedTime when opening after internal clear', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      const input = screen.getByRole('textbox')
+      // Open
+      fireEvent.click(input)
+
+      // Clear selected time internally
+      const clearButton = screen.getByRole('button', { name: /operation\.clear/i })
+      fireEvent.click(clearButton)
+
+      // Close
+      fireEvent.click(input)
+
+      // Open again - should resync selectedTime from value prop
+      fireEvent.click(input)
+
+      // Confirm to verify the value was resynced
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(isDayjsObject(emitted)).toBe(true)
+      // Resynced from value prop: dayjs('2024-01-01T10:30:00Z') in UTC = 10:30 AM
+      expect(emitted.hour()).toBe(10)
+      expect(emitted.minute()).toBe(30)
+    })
+  })
+
+  // Props tests
+  describe('Props', () => {
+    it('should show custom placeholder when provided', () => {
+      render(
+        <TimePicker
+          {...baseProps}
+          placeholder="Select time"
+        />,
+      )
+
+      const input = screen.getByRole('textbox')
+      expect(input).toHaveAttribute('placeholder', 'Select time')
+    })
+
+    it('should render with triggerFullWidth prop without errors', () => {
+      render(
+        <TimePicker
+          {...baseProps}
+          triggerFullWidth={true}
+        />,
+      )
+
+      // Verify the component renders successfully with triggerFullWidth
+      expect(screen.getByRole('textbox')).toBeInTheDocument()
+    })
+
+    it('should use renderTrigger when provided', () => {
+      const renderTrigger = vi.fn(({ inputElem, onClick }) => (
+        <div data-testid="custom-trigger" onClick={onClick}>
+          {inputElem}
+        </div>
+      ))
+
+      render(
+        <TimePicker
+          {...baseProps}
+          renderTrigger={renderTrigger}
+        />,
+      )
+
+      expect(screen.getByTestId('custom-trigger')).toBeInTheDocument()
+      expect(renderTrigger).toHaveBeenCalled()
+    })
+
+    it('should render with notClearable prop without errors', () => {
+      render(
+        <TimePicker
+          {...baseProps}
+          notClearable={true}
+          value="10:00 AM"
+          timezone="UTC"
+        />,
+      )
+
+      // In test env the icon stays in DOM, but must remain hidden when notClearable is set
+      expect(screen.getByRole('button', { name: /clear/i })).toHaveClass('hidden')
+    })
+  })
+
+  // Confirm behavior tests
+  describe('Confirm Behavior', () => {
+    it('should emit selected time when confirm is clicked with a value', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      // Open the picker first to access content
+      fireEvent.click(screen.getByRole('textbox'))
+
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(isDayjsObject(emitted)).toBe(true)
+      expect(emitted.hour()).toBe(10)
+      expect(emitted.minute()).toBe(30)
+    })
+  })
+
+  // Time selection handler tests
+  describe('Time Selection', () => {
+    const openPicker = () => {
+      fireEvent.click(screen.getByRole('textbox'))
+    }
+
+    const getHourAndMinuteLists = () => {
+      const allLists = screen.getAllByRole('list')
+      const hourList = allLists.find(list =>
+        within(list).queryByText('01')
+        && within(list).queryByText('12')
+        && !within(list).queryByText('59'))
+      const minuteList = allLists.find(list =>
+        within(list).queryByText('00')
+        && within(list).queryByText('59'))
+
+      expect(hourList).toBeTruthy()
+      expect(minuteList).toBeTruthy()
+
+      return {
+        hourList: hourList!,
+        minuteList: minuteList!,
+      }
+    }
+
+    it('should update selectedTime when hour is selected', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      openPicker()
+
+      // Click hour "05" from the time options
+      const { hourList } = getHourAndMinuteLists()
+      fireEvent.click(within(hourList).getByText('05'))
+
+      // Now confirm to verify the selectedTime was updated
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(isDayjsObject(emitted)).toBe(true)
+      // Hour 05 in AM (since original was 10:30 AM) = 5
+      expect(emitted.hour()).toBe(5)
+    })
+
+    it('should update selectedTime when minute is selected', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      openPicker()
+
+      // Click minute "45" from the time options
+      const { minuteList } = getHourAndMinuteLists()
+      fireEvent.click(within(minuteList).getByText('45'))
+
+      // Confirm
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(emitted.minute()).toBe(45)
+    })
+
+    it('should update selectedTime when period is changed', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      openPicker()
+
+      // Click PM to switch period
+      fireEvent.click(screen.getByText('PM'))
+
+      // Confirm
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      // Original was 10:30 AM, switching to PM makes it 22:30
+      expect(emitted.hour()).toBe(22)
+    })
+
+    it('should create new time when selecting hour without prior selectedTime', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          timezone="UTC"
+        />,
+      )
+
+      openPicker()
+
+      // Click hour "03" with no existing selectedTime
+      const { hourList } = getHourAndMinuteLists()
+      fireEvent.click(within(hourList).getByText('03'))
+
+      // Confirm
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(isDayjsObject(emitted)).toBe(true)
+      expect(emitted.hour()).toBe(3)
+    })
+
+    it('should handle minute selection without prior selectedTime', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          timezone="UTC"
+        />,
+      )
+
+      openPicker()
+
+      // Click minute "15" with no existing selectedTime
+      const { minuteList } = getHourAndMinuteLists()
+      fireEvent.click(within(minuteList).getByText('15'))
+
+      // Confirm
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(emitted.minute()).toBe(15)
+    })
+
+    it('should handle period selection without prior selectedTime', () => {
+      const onChange = vi.fn()
+      render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          timezone="UTC"
+        />,
+      )
+
+      openPicker()
+
+      // Click PM with no existing selectedTime
+      fireEvent.click(screen.getByText('PM'))
+
+      // Confirm
+      const confirmButton = screen.getByRole('button', { name: /operation\.ok/i })
+      fireEvent.click(confirmButton)
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(isDayjsObject(emitted)).toBe(true)
+      expect(emitted.hour()).toBeGreaterThanOrEqual(12)
+    })
+  })
+
+  // Timezone change effect tests
+  describe('Timezone Changes', () => {
+    it('should call onChange when timezone changes with an existing value', () => {
+      const onChange = vi.fn()
+      const value = dayjs('2024-01-01T10:30:00Z')
+      const { rerender } = render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={value}
+          timezone="UTC"
+        />,
+      )
+
+      // Change timezone without changing value (same reference)
+      rerender(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={value}
+          timezone="America/New_York"
+        />,
+      )
+
+      expect(onChange).toHaveBeenCalledTimes(1)
+      const emitted = onChange.mock.calls[0][0]
+      expect(isDayjsObject(emitted)).toBe(true)
+      // 10:30 UTC converted to America/New_York (UTC-5 in Jan) = 05:30
+      expect(emitted.utcOffset()).toBe(dayjs().tz('America/New_York').utcOffset())
+      expect(emitted.hour()).toBe(5)
+      expect(emitted.minute()).toBe(30)
+    })
+
+    it('should update selectedTime when value changes', () => {
+      const onChange = vi.fn()
+      const { rerender } = render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      // Change value
+      rerender(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T14:00:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      // onChange should not be called when only value changes (no timezone change)
+      expect(onChange).not.toHaveBeenCalled()
+
+      // But the display should update
+      expect(screen.getByDisplayValue('02:00 PM')).toBeInTheDocument()
+    })
+
+    it('should handle timezone change when value is undefined', () => {
+      const onChange = vi.fn()
+      const { rerender } = render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          timezone="UTC"
+        />,
+      )
+
+      // Change timezone without a value
+      rerender(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          timezone="America/New_York"
+        />,
+      )
+
+      // onChange should not be called when value is undefined
+      expect(onChange).not.toHaveBeenCalled()
+    })
+
+    it('should handle timezone change when selectedTime exists but value becomes undefined', () => {
+      const onChange = vi.fn()
+      const { rerender } = render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+      // Remove value and change timezone
+      rerender(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={undefined}
+          timezone="America/New_York"
+        />,
+      )
+      // Input should be empty now
+      expect(screen.getByRole('textbox')).toHaveValue('')
+      // onChange should not fire when value is undefined, even if selectedTime was set
+      expect(onChange).not.toHaveBeenCalled()
+    })
+
+    it('should not update when neither timezone nor value changes', () => {
+      const onChange = vi.fn()
+      const value = dayjs('2024-01-01T10:30:00Z')
+      const { rerender } = render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={value}
+          timezone="UTC"
+        />,
+      )
+
+      // Rerender with same props
+      rerender(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={value}
+          timezone="UTC"
+        />,
+      )
+
+      expect(onChange).not.toHaveBeenCalled()
+    })
+
+    it('should update display when both value and timezone change', () => {
+      const onChange = vi.fn()
+      const { rerender } = render(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T10:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      // Change both value and timezone simultaneously
+      rerender(
+        <TimePicker
+          {...baseProps}
+          onChange={onChange}
+          value={dayjs('2024-01-01T15:00:00Z')}
+          timezone="America/New_York"
+        />,
+      )
+
+      // onChange should not be called since both changed (timezoneChanged && !valueChanged is false)
+      expect(onChange).not.toHaveBeenCalled()
+
+      // 15:00 UTC in America/New_York (UTC-5) = 10:00 AM
+      expect(screen.getByDisplayValue('10:00 AM')).toBeInTheDocument()
+    })
+  })
+
+  // Format time value tests
+  describe('Format Time Value', () => {
+    it('should return empty string when value is undefined', () => {
+      render(<TimePicker {...baseProps} />)
+
+      expect(screen.getByRole('textbox')).toHaveValue('')
+    })
+
+    it('should format dayjs value correctly', () => {
+      render(
+        <TimePicker
+          {...baseProps}
+          value={dayjs('2024-01-01T14:30:00Z')}
+          timezone="UTC"
+        />,
+      )
+
+      expect(screen.getByDisplayValue('02:30 PM')).toBeInTheDocument()
+    })
+
+    it('should format string value correctly', () => {
+      render(
+        <TimePicker
+          {...baseProps}
+          value="09:15"
+          timezone="UTC"
+        />,
+      )
+
+      expect(screen.getByDisplayValue('09:15 AM')).toBeInTheDocument()
+    })
+  })
+
   describe('Timezone Label Integration', () => {
     it('should not display timezone label by default', () => {
       render(
diff --git a/web/app/components/base/date-and-time-picker/time-picker/options.spec.tsx b/web/app/components/base/date-and-time-picker/time-picker/options.spec.tsx
new file mode 100644
index 0000000000..9f169eb010
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/time-picker/options.spec.tsx
@@ -0,0 +1,97 @@
+import type { TimeOptionsProps } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import dayjs from '../utils/dayjs'
+import Options from './options'
+
+beforeAll(() => {
+  Element.prototype.scrollIntoView = vi.fn()
+})
+
+const createOptionsProps = (overrides: Partial<TimeOptionsProps> = {}): TimeOptionsProps => ({
+  selectedTime: undefined,
+  handleSelectHour: vi.fn(),
+  handleSelectMinute: vi.fn(),
+  handleSelectPeriod: vi.fn(),
+  ...overrides,
+})
+
+describe('TimePickerOptions', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  describe('Rendering', () => {
+    it('should render hour options', () => {
+      const props = createOptionsProps()
+
+      render(<Options {...props} />)
+
+      const allItems = screen.getAllByRole('listitem')
+      expect(allItems.length).toBeGreaterThan(12)
+    })
+
+    it('should render all hour, minute, and period options by default', () => {
+      const props = createOptionsProps()
+      render(<Options {...props} />)
+      const allItems = screen.getAllByRole('listitem')
+      // 12 hours + 60 minutes + 2 periods
+      expect(allItems).toHaveLength(74)
+    })
+
+    it('should render AM and PM period options', () => {
+      const props = createOptionsProps()
+
+      render(<Options {...props} />)
+
+      expect(screen.getByText('AM')).toBeInTheDocument()
+      expect(screen.getByText('PM')).toBeInTheDocument()
+    })
+  })
+
+  describe('Minute Filter', () => {
+    it('should apply minuteFilter when provided', () => {
+      const minuteFilter = (minutes: string[]) => minutes.filter(m => Number(m) % 15 === 0)
+      const props = createOptionsProps({ minuteFilter })
+
+      render(<Options {...props} />)
+
+      const allItems = screen.getAllByRole('listitem')
+      expect(allItems).toHaveLength(18)
+    })
+  })
+
+  describe('Interactions', () => {
+    it('should render selected hour in the list', () => {
+      const props = createOptionsProps({ selectedTime: dayjs('2024-01-01 05:30:00') })
+      render(<Options {...props} />)
+      const selectedHour = screen.getAllByRole('listitem').find(item => item.textContent === '05')
+      expect(selectedHour).toHaveClass('bg-components-button-ghost-bg-hover')
+    })
+    it('should render selected minute in the list', () => {
+      const props = createOptionsProps({ selectedTime: dayjs('2024-01-01 05:30:00') })
+      render(<Options {...props} />)
+      const selectedMinute = screen.getAllByRole('listitem').find(item => item.textContent === '30')
+      expect(selectedMinute).toHaveClass('bg-components-button-ghost-bg-hover')
+    })
+
+    it('should call handleSelectPeriod when AM is clicked', () => {
+      const handleSelectPeriod = vi.fn()
+      const props = createOptionsProps({ handleSelectPeriod })
+
+      render(<Options {...props} />)
+      fireEvent.click(screen.getAllByText('AM')[0])
+
+      expect(handleSelectPeriod).toHaveBeenCalledWith('AM')
+    })
+
+    it('should call handleSelectPeriod when PM is clicked', () => {
+      const handleSelectPeriod = vi.fn()
+      const props = createOptionsProps({ handleSelectPeriod })
+
+      render(<Options {...props} />)
+      fireEvent.click(screen.getAllByText('PM')[0])
+
+      expect(handleSelectPeriod).toHaveBeenCalledWith('PM')
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/utils/dayjs-extended.spec.ts b/web/app/components/base/date-and-time-picker/utils/dayjs-extended.spec.ts
new file mode 100644
index 0000000000..a5c80ff35c
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/utils/dayjs-extended.spec.ts
@@ -0,0 +1,366 @@
+import dayjs, {
+  clearMonthMapCache,
+  cloneTime,
+  formatDateForOutput,
+  getDateWithTimezone,
+  getDaysInMonth,
+  getHourIn12Hour,
+  parseDateWithFormat,
+  toDayjs,
+} from './dayjs'
+
+describe('dayjs extended utilities', () => {
+  // Tests for cloneTime
+  describe('cloneTime', () => {
+    it('should copy hour and minute from source to target', () => {
+      const target = dayjs('2024-01-15')
+      const source = dayjs('2024-06-20 14:30')
+
+      const result = cloneTime(target, source)
+
+      expect(result.hour()).toBe(14)
+      expect(result.minute()).toBe(30)
+      expect(result.date()).toBe(15)
+      expect(result.month()).toBe(0) // January
+    })
+
+    it('should not mutate the original target date', () => {
+      const target = dayjs('2024-01-15 08:00')
+      const source = dayjs('2024-06-20 14:30')
+
+      cloneTime(target, source)
+
+      expect(target.hour()).toBe(8)
+      expect(target.minute()).toBe(0)
+    })
+  })
+
+  // Tests for getDaysInMonth
+  describe('getDaysInMonth', () => {
+    beforeEach(() => {
+      clearMonthMapCache()
+    })
+
+    it('should return an array of Day objects', () => {
+      const date = dayjs('2024-06-15')
+      const days = getDaysInMonth(date)
+
+      expect(days.length).toBeGreaterThan(0)
+      days.forEach((day) => {
+        expect(day).toHaveProperty('date')
+        expect(day).toHaveProperty('isCurrentMonth')
+      })
+    })
+
+    it('should include days from previous and next month to fill the grid', () => {
+      const date = dayjs('2024-06-15') // June 2024 starts on Saturday
+      const days = getDaysInMonth(date)
+
+      const prevMonthDays = days.filter(d => !d.isCurrentMonth && d.date.month() < date.month())
+      const nextMonthDays = days.filter(d => !d.isCurrentMonth && d.date.month() > date.month())
+
+      // June 2024 starts on Saturday (6), so there are 6 days from previous month
+      expect(prevMonthDays.length).toBeGreaterThan(0)
+      expect(nextMonthDays.length).toBeGreaterThan(0)
+    })
+
+    it('should mark current month days correctly', () => {
+      const date = dayjs('2024-06-15')
+      const days = getDaysInMonth(date)
+
+      const currentMonthDays = days.filter(d => d.isCurrentMonth)
+      // June has 30 days
+      expect(currentMonthDays).toHaveLength(30)
+    })
+
+    it('should cache results for the same month', () => {
+      const date1 = dayjs('2024-06-15')
+      const date2 = dayjs('2024-06-20')
+
+      const days1 = getDaysInMonth(date1)
+      const days2 = getDaysInMonth(date2)
+
+      // Same reference since it's cached
+      expect(days1).toBe(days2)
+    })
+
+    it('should return different results for different months', () => {
+      const june = dayjs('2024-06-15')
+      const july = dayjs('2024-07-15')
+
+      const juneDays = getDaysInMonth(june)
+      const julyDays = getDaysInMonth(july)
+
+      expect(juneDays).not.toBe(julyDays)
+    })
+  })
+
+  // Tests for clearMonthMapCache
+  describe('clearMonthMapCache', () => {
+    it('should clear the cache so new days are generated', () => {
+      const date = dayjs('2024-06-15')
+
+      const days1 = getDaysInMonth(date)
+      clearMonthMapCache()
+      const days2 = getDaysInMonth(date)
+
+      // After clearing cache, a new array should be created
+      expect(days1).not.toBe(days2)
+      // But should have the same length
+      expect(days1.length).toBe(days2.length)
+    })
+  })
+
+  // Tests for getHourIn12Hour
+  describe('getHourIn12Hour', () => {
+    it('should return 12 for midnight (hour 0)', () => {
+      const date = dayjs('2024-01-01 00:00')
+      expect(getHourIn12Hour(date)).toBe(12)
+    })
+
+    it('should return hour as-is for 1-11 AM', () => {
+      expect(getHourIn12Hour(dayjs('2024-01-01 01:00'))).toBe(1)
+      expect(getHourIn12Hour(dayjs('2024-01-01 11:00'))).toBe(11)
+    })
+
+    it('should return 0 for noon (hour 12)', () => {
+      const date = dayjs('2024-01-01 12:00')
+      expect(getHourIn12Hour(date)).toBe(0)
+    })
+
+    it('should return hour - 12 for PM hours (13-23)', () => {
+      expect(getHourIn12Hour(dayjs('2024-01-01 13:00'))).toBe(1)
+      expect(getHourIn12Hour(dayjs('2024-01-01 23:00'))).toBe(11)
+    })
+  })
+
+  // Tests for getDateWithTimezone
+  describe('getDateWithTimezone', () => {
+    it('should return a cloned date when no timezone is provided', () => {
+      const date = dayjs('2024-06-15')
+      const result = getDateWithTimezone({ date })
+
+      expect(result.format('YYYY-MM-DD')).toBe('2024-06-15')
+    })
+
+    it('should return current date clone when neither date nor timezone is provided', () => {
+      const result = getDateWithTimezone({})
+      const now = dayjs()
+
+      expect(result.format('YYYY-MM-DD')).toBe(now.format('YYYY-MM-DD'))
+    })
+
+    it('should apply timezone to provided date', () => {
+      const date = dayjs('2024-06-15T12:00:00')
+      const result = getDateWithTimezone({ date, timezone: 'America/New_York' })
+
+      // dayjs.tz converts the date to the given timezone
+      expect(result).toBeDefined()
+      expect(result.isValid()).toBe(true)
+    })
+
+    it('should return current time in timezone when only timezone is provided', () => {
+      const result = getDateWithTimezone({ timezone: 'Asia/Tokyo' })
+
+      expect(result.utcOffset()).toBe(dayjs().tz('Asia/Tokyo').utcOffset())
+    })
+  })
+
+  // Tests for toDayjs additional edge cases
+  describe('toDayjs edge cases', () => {
+    it('should return undefined for empty string', () => {
+      expect(toDayjs('')).toBeUndefined()
+    })
+
+    it('should return undefined for undefined', () => {
+      expect(toDayjs(undefined)).toBeUndefined()
+    })
+
+    it('should handle Dayjs object input', () => {
+      const date = dayjs('2024-06-15')
+      const result = toDayjs(date)
+
+      expect(result).toBeDefined()
+      expect(result?.format('YYYY-MM-DD')).toBe('2024-06-15')
+    })
+
+    it('should handle Dayjs object with timezone', () => {
+      const date = dayjs('2024-06-15T12:00:00')
+      const result = toDayjs(date, { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+    })
+
+    it('should parse with custom format when format matches common formats', () => {
+      // Uses a format from COMMON_PARSE_FORMATS
+      const result = toDayjs('2024-06-15', { format: 'YYYY-MM-DD' })
+
+      expect(result).toBeDefined()
+      expect(result?.format('YYYY-MM-DD')).toBe('2024-06-15')
+    })
+
+    it('should fall back when custom format does not match', () => {
+      // dayjs strict mode with format requires customParseFormat plugin
+      // which is not loaded, so invalid format falls through to other parsing
+      const result = toDayjs('2024-06-15', { format: 'INVALID', timezone: 'UTC' })
+
+      // It will still be parsed by fallback mechanisms
+      expect(result).toBeDefined()
+    })
+
+    it('should parse time with seconds', () => {
+      const result = toDayjs('14:30:45', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      expect(result?.hour()).toBe(14)
+      expect(result?.minute()).toBe(30)
+      expect(result?.second()).toBe(45)
+    })
+
+    it('should parse time with milliseconds', () => {
+      const result = toDayjs('14:30:45.123', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      expect(result?.millisecond()).toBe(123)
+    })
+
+    it('should normalize short milliseconds by padding', () => {
+      const result = toDayjs('14:30:45.1', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      expect(result?.millisecond()).toBe(100)
+    })
+
+    it('should truncate long milliseconds to 3 digits', () => {
+      // The time regex only captures up to 3 digits for ms, so 4+ digit values
+      // don't match the regex and fall through to common format parsing
+      const result = toDayjs('14:30:45.12', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      // 2-digit ms "12" gets padded to "120"
+      expect(result?.millisecond()).toBe(120)
+    })
+
+    it('should parse 12-hour AM time', () => {
+      const result = toDayjs('07:15 AM', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      expect(result?.hour()).toBe(7)
+      expect(result?.minute()).toBe(15)
+    })
+
+    it('should parse 12-hour time with seconds', () => {
+      const result = toDayjs('07:15:30 PM', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      expect(result?.hour()).toBe(19)
+      expect(result?.second()).toBe(30)
+    })
+
+    it('should handle 12 PM correctly', () => {
+      const result = toDayjs('12:00 PM', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      expect(result?.hour()).toBe(12)
+    })
+
+    it('should handle 12 AM correctly', () => {
+      const result = toDayjs('12:00 AM', { timezone: 'UTC' })
+
+      expect(result).toBeDefined()
+      expect(result?.hour()).toBe(0)
+    })
+
+    it('should use custom formats array when provided', () => {
+      const result = toDayjs('2024.06.15', { formats: ['YYYY.MM.DD'] })
+
+      expect(result).toBeDefined()
+      expect(result?.format('YYYY-MM-DD')).toBe('2024-06-15')
+    })
+
+    it('should fall back to native parsing for ISO strings', () => {
+      const result = toDayjs('2024-06-15T12:00:00.000Z')
+
+      expect(result).toBeDefined()
+    })
+
+    it('should return undefined for completely unparseable value', () => {
+      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {})
+      const result = toDayjs('not-a-date')
+
+      expect(result).toBeUndefined()
+      consoleSpy.mockRestore()
+    })
+  })
+
+  // Tests for parseDateWithFormat
+  describe('parseDateWithFormat', () => {
+    it('should return null for empty string', () => {
+      expect(parseDateWithFormat('')).toBeNull()
+    })
+
+    it('should parse with provided format from common formats', () => {
+      // Uses YYYY-MM-DD which is in COMMON_PARSE_FORMATS
+      const result = parseDateWithFormat('2024-06-15', 'YYYY-MM-DD')
+
+      expect(result).not.toBeNull()
+      expect(result?.format('YYYY-MM-DD')).toBe('2024-06-15')
+    })
+
+    it('should return null for invalid date with format', () => {
+      const result = parseDateWithFormat('not-a-date', 'YYYY-MM-DD')
+
+      expect(result).toBeNull()
+    })
+
+    it('should try common formats when no format is specified', () => {
+      const result = parseDateWithFormat('2024-06-15')
+
+      expect(result).not.toBeNull()
+      expect(result?.format('YYYY-MM-DD')).toBe('2024-06-15')
+    })
+
+    it('should parse ISO datetime format', () => {
+      const result = parseDateWithFormat('2024-06-15T12:00:00')
+
+      expect(result).not.toBeNull()
+    })
+
+    it('should return null for unparseable string without format', () => {
+      const result = parseDateWithFormat('gibberish')
+
+      expect(result).toBeNull()
+    })
+  })
+
+  // Tests for formatDateForOutput
+  describe('formatDateForOutput', () => {
+    it('should return empty string for invalid date', () => {
+      const invalidDate = dayjs('invalid')
+      expect(formatDateForOutput(invalidDate)).toBe('')
+    })
+
+    it('should format date-only output without time', () => {
+      const date = dayjs('2024-06-15T12:00:00')
+      const result = formatDateForOutput(date)
+
+      expect(result).toBe('2024-06-15')
+    })
+
+    it('should format with time when includeTime is true', () => {
+      const date = dayjs('2024-06-15T12:00:00')
+      const result = formatDateForOutput(date, true)
+
+      expect(result).toContain('2024-06-15')
+      expect(result).toContain('12:00:00')
+    })
+
+    it('should default to date-only format', () => {
+      const date = dayjs('2024-06-15T14:30:00')
+      const result = formatDateForOutput(date)
+
+      expect(result).toBe('2024-06-15')
+      expect(result).not.toContain('14:30')
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/year-and-month-picker/footer.spec.tsx b/web/app/components/base/date-and-time-picker/year-and-month-picker/footer.spec.tsx
new file mode 100644
index 0000000000..7c3815d22f
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/year-and-month-picker/footer.spec.tsx
@@ -0,0 +1,50 @@
+import type { YearAndMonthPickerFooterProps } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import Footer from './footer'
+
+// Factory for Footer props
+const createFooterProps = (overrides: Partial<YearAndMonthPickerFooterProps> = {}): YearAndMonthPickerFooterProps => ({
+  handleYearMonthCancel: vi.fn(),
+  handleYearMonthConfirm: vi.fn(),
+  ...overrides,
+})
+
+describe('YearAndMonthPicker Footer', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should render Cancel and OK buttons', () => {
+      const props = createFooterProps()
+      render(<Footer {...props} />)
+
+      expect(screen.getByText(/operation\.cancel/)).toBeInTheDocument()
+      expect(screen.getByText(/operation\.ok/)).toBeInTheDocument()
+    })
+  })
+
+  // Interaction tests
+  describe('Interactions', () => {
+    it('should call handleYearMonthCancel when Cancel button is clicked', () => {
+      const handleYearMonthCancel = vi.fn()
+      const props = createFooterProps({ handleYearMonthCancel })
+      render(<Footer {...props} />)
+
+      fireEvent.click(screen.getByText(/operation\.cancel/))
+
+      expect(handleYearMonthCancel).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call handleYearMonthConfirm when OK button is clicked', () => {
+      const handleYearMonthConfirm = vi.fn()
+      const props = createFooterProps({ handleYearMonthConfirm })
+      render(<Footer {...props} />)
+
+      fireEvent.click(screen.getByText(/operation\.ok/))
+
+      expect(handleYearMonthConfirm).toHaveBeenCalledTimes(1)
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/year-and-month-picker/header.spec.tsx b/web/app/components/base/date-and-time-picker/year-and-month-picker/header.spec.tsx
new file mode 100644
index 0000000000..91c0bc6947
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/year-and-month-picker/header.spec.tsx
@@ -0,0 +1,47 @@
+import type { YearAndMonthPickerHeaderProps } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import Header from './header'
+
+// Factory for Header props
+const createHeaderProps = (overrides: Partial<YearAndMonthPickerHeaderProps> = {}): YearAndMonthPickerHeaderProps => ({
+  selectedYear: 2024,
+  selectedMonth: 5, // June (0-indexed)
+  onClick: vi.fn(),
+  ...overrides,
+})
+
+describe('YearAndMonthPicker Header', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  // Rendering tests
+  describe('Rendering', () => {
+    it('should display the selected year', () => {
+      const props = createHeaderProps({ selectedYear: 2024 })
+      render(<Header {...props} />)
+
+      expect(screen.getByText(/2024/)).toBeInTheDocument()
+    })
+
+    it('should render a clickable button', () => {
+      const props = createHeaderProps()
+      render(<Header {...props} />)
+
+      expect(screen.getByRole('button')).toBeInTheDocument()
+    })
+  })
+
+  // Interaction tests
+  describe('Interactions', () => {
+    it('should call onClick when the header button is clicked', () => {
+      const onClick = vi.fn()
+      const props = createHeaderProps({ onClick })
+      render(<Header {...props} />)
+
+      fireEvent.click(screen.getByRole('button'))
+
+      expect(onClick).toHaveBeenCalledTimes(1)
+    })
+  })
+})
diff --git a/web/app/components/base/date-and-time-picker/year-and-month-picker/options.spec.tsx b/web/app/components/base/date-and-time-picker/year-and-month-picker/options.spec.tsx
new file mode 100644
index 0000000000..d4319650f5
--- /dev/null
+++ b/web/app/components/base/date-and-time-picker/year-and-month-picker/options.spec.tsx
@@ -0,0 +1,81 @@
+import type { YearAndMonthPickerOptionsProps } from '../types'
+import { fireEvent, render, screen } from '@testing-library/react'
+import Options from './options'
+
+beforeAll(() => {
+  Element.prototype.scrollIntoView = vi.fn()
+})
+
+const createOptionsProps = (overrides: Partial<YearAndMonthPickerOptionsProps> = {}): YearAndMonthPickerOptionsProps => ({
+  selectedMonth: 5,
+  selectedYear: 2024,
+  handleMonthSelect: vi.fn(),
+  handleYearSelect: vi.fn(),
+  ...overrides,
+})
+
+describe('YearAndMonthPicker Options', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  describe('Rendering', () => {
+    it('should render month options', () => {
+      const props = createOptionsProps()
+
+      render(<Options {...props} />)
+
+      const monthItems = screen.getAllByText(/months\./)
+      expect(monthItems).toHaveLength(12)
+    })
+
+    it('should render year options', () => {
+      const props = createOptionsProps()
+
+      render(<Options {...props} />)
+
+      const allItems = screen.getAllByRole('listitem')
+      expect(allItems).toHaveLength(212)
+    })
+  })
+
+  describe('Interactions', () => {
+    it('should call handleMonthSelect when a month is clicked', () => {
+      const handleMonthSelect = vi.fn()
+      const props = createOptionsProps({ handleMonthSelect })
+      render(<Options {...props} />)
+      // The mock returns 'time.months.January' for the first month
+      fireEvent.click(screen.getByText(/months\.January/))
+      expect(handleMonthSelect).toHaveBeenCalledWith(0)
+    })
+
+    it('should call handleYearSelect when a year is clicked', () => {
+      const handleYearSelect = vi.fn()
+      const props = createOptionsProps({ handleYearSelect })
+
+      render(<Options {...props} />)
+      fireEvent.click(screen.getByText('2024'))
+
+      expect(handleYearSelect).toHaveBeenCalledWith(2024)
+    })
+  })
+
+  describe('Selection', () => {
+    it('should render selected month in the list', () => {
+      const props = createOptionsProps({ selectedMonth: 0 })
+
+      render(<Options {...props} />)
+
+      const monthItems = screen.getAllByText(/months\./)
+      expect(monthItems.length).toBeGreaterThan(0)
+    })
+
+    it('should render selected year in the list', () => {
+      const props = createOptionsProps({ selectedYear: 2024 })
+
+      render(<Options {...props} />)
+
+      expect(screen.getByText('2024')).toBeInTheDocument()
+    })
+  })
+})