Calendar

July 2026

import * as React from "react"

import { Calendar } from "@/components/ui/calendar"

export default function CalendarDemo() {
  const [date, setDate] = React.useState<Date | undefined>(new Date())

  return (
    <Calendar
      mode="single"
      selected={date}
      onSelect={setDate}
      className="rounded-md border"
    />
  )
}

Installation

npx logic2b@latest add calendar

Working with an AI assistant? Copy this prompt into Claude Code, Cursor or Copilot — it carries the install steps, a no-CLI fallback and a verification checklist.

Add the "calendar" item from the logic2b ui registry (https://ui.logic2b.com) to this project. Follow every step and verify at the end.

## Steps

1. If the project has no `components.json` yet, set up logic2b ui first:

   ```bash
   npx logic2b@latest init
   ```

2. Install the item (the CLI resolves registry dependencies automatically):

   ```bash
   npx logic2b@latest add calendar
   ```

3. Install any npm dependencies the command prints.

## If the CLI is not available

Do it manually from the registry payload:

1. Fetch https://ui.logic2b.com/r/calendar.json.
2. Write every entry in `files[]` to its mapped project path (see below).
3. Repeat (recursively) for each name in `registryDependencies`.
4. Install every package listed in `dependencies` across those payloads.

## Registry reference

- Index of every item: https://ui.logic2b.com/r/index.json
- Item payload (full source): https://ui.logic2b.com/r/<name>.json
- Usage examples per item: https://ui.logic2b.com/r/demos/index.json → https://ui.logic2b.com/r/demos/<demo>.json
- Docs index for agents: https://ui.logic2b.com/llms.txt (full docs: https://ui.logic2b.com/llms-full.txt)
- Every docs page is Markdown when you append `.md` to its URL.

Registry file paths map to project paths like this:
- `ui/*` → `@/components/ui/*`
- `blocks/<name>/*` → `@/components/*`
- `charts/*` → `@/components/charts/*`
- `hooks/*` → `@/hooks/*`
- `lib/utils.ts` → `@/lib/utils.ts`
- `theme.css` → next to the project's Tailwind entry stylesheet

## Conventions (do not break these)

- Tailwind CSS v4 (CSS-first config; no tailwind.config.js needed) and React 19.
- All colors go through semantic tokens (`bg-primary`, `text-muted-foreground`,
  `border-border`, …). Never hardcode hex/oklch values in components.
- Dark mode is class-based: toggle `.dark` on `<html>`.
- Icons come from lucide-react.

## Verify before finishing

1. The dev server starts and the app renders without console errors.
2. TypeScript compiles (`tsc --noEmit` or the framework's check).
3. Components use the theme: a `<Button>` shows the primary token color,
   and toggling `.dark` on `<html>` switches the palette.

Install the dependencies:

npm install react-day-picker lucide-react

Copy into ui/calendar.tsx:

"use client"

import * as React from "react"
import { ChevronDownIcon, ChevronLeftIcon, ChevronRightIcon } from "lucide-react"
import { DayButton, DayPicker, getDefaultClassNames } from "react-day-picker"

import { cn } from "@/lib/utils"
import { Button, buttonVariants } from "@/components/ui/button"

function Calendar({
  className,
  classNames,
  showOutsideDays = true,
  captionLayout = "label",
  buttonVariant = "ghost",
  formatters,
  components,
  ...props
}: React.ComponentProps<typeof DayPicker> & {
  buttonVariant?: React.ComponentProps<typeof Button>["variant"]
}) {
  const defaultClassNames = getDefaultClassNames()

  return (
    <DayPicker
      showOutsideDays={showOutsideDays}
      className={cn(
        "bg-background group/calendar p-3 [--cell-size:--spacing(8)] [[data-slot=card-content]_&]:bg-transparent [[data-slot=popover-content]_&]:bg-transparent",
        className
      )}
      captionLayout={captionLayout}
      formatters={{
        formatMonthDropdown: (date) =>
          date.toLocaleString("default", { month: "short" }),
        ...formatters,
      }}
      classNames={{
        root: cn("w-fit", defaultClassNames.root),
        months: cn(
          "relative flex flex-col gap-4 md:flex-row",
          defaultClassNames.months
        ),
        month: cn("flex w-full flex-col gap-4", defaultClassNames.month),
        nav: cn(
          "absolute inset-x-0 top-0 flex w-full items-center justify-between gap-1",
          defaultClassNames.nav
        ),
        button_previous: cn(
          buttonVariants({ variant: buttonVariant }),
          "size-(--cell-size) select-none p-0 aria-disabled:opacity-50",
          defaultClassNames.button_previous
        ),
        button_next: cn(
          buttonVariants({ variant: buttonVariant }),
          "size-(--cell-size) select-none p-0 aria-disabled:opacity-50",
          defaultClassNames.button_next
        ),
        month_caption: cn(
          "flex h-(--cell-size) w-full items-center justify-center px-(--cell-size)",
          defaultClassNames.month_caption
        ),
        dropdowns: cn(
          "flex h-(--cell-size) w-full items-center justify-center gap-1.5 text-sm font-medium",
          defaultClassNames.dropdowns
        ),
        dropdown_root: cn(
          "has-focus:border-ring border-input shadow-xs has-focus:ring-ring/50 has-focus:ring-[3px] relative rounded-md border",
          defaultClassNames.dropdown_root
        ),
        dropdown: cn("absolute inset-0 opacity-0", defaultClassNames.dropdown),
        caption_label: cn(
          "select-none font-medium",
          captionLayout === "label"
            ? "text-sm"
            : "[&>svg]:text-muted-foreground flex h-8 items-center gap-1 rounded-md pr-1 pl-2 text-sm [&>svg]:size-3.5",
          defaultClassNames.caption_label
        ),
        month_grid: cn("w-full border-collapse", defaultClassNames.month_grid),
        weekdays: cn("flex", defaultClassNames.weekdays),
        weekday: cn(
          "text-muted-foreground flex-1 rounded-md text-[0.8rem] font-normal select-none",
          defaultClassNames.weekday
        ),
        week: cn("mt-2 flex w-full", defaultClassNames.week),
        week_number_header: cn(
          "w-(--cell-size) select-none",
          defaultClassNames.week_number_header
        ),
        week_number: cn(
          "text-muted-foreground text-[0.8rem] select-none",
          defaultClassNames.week_number
        ),
        day: cn(
          "group/day relative aspect-square h-full w-full p-0 text-center select-none [&:first-child[data-selected=true]_button]:rounded-l-md [&:last-child[data-selected=true]_button]:rounded-r-md",
          defaultClassNames.day
        ),
        range_start: cn("bg-accent rounded-l-md", defaultClassNames.range_start),
        range_middle: cn("rounded-none", defaultClassNames.range_middle),
        range_end: cn("bg-accent rounded-r-md", defaultClassNames.range_end),
        today: cn(
          "bg-accent text-accent-foreground rounded-md data-[selected=true]:rounded-none",
          defaultClassNames.today
        ),
        outside: cn(
          "text-muted-foreground aria-selected:text-muted-foreground",
          defaultClassNames.outside
        ),
        disabled: cn(
          "text-muted-foreground opacity-50",
          defaultClassNames.disabled
        ),
        hidden: cn("invisible", defaultClassNames.hidden),
        ...classNames,
      }}
      components={{
        Root: ({ className, rootRef, ...props }) => (
          <div
            data-slot="calendar"
            ref={rootRef}
            className={cn(className)}
            {...props}
          />
        ),
        Chevron: ({ className, orientation, ...props }) => {
          if (orientation === "left") {
            return (
              <ChevronLeftIcon className={cn("size-4", className)} {...props} />
            )
          }
          if (orientation === "right") {
            return (
              <ChevronRightIcon
                className={cn("size-4", className)}
                {...props}
              />
            )
          }
          return (
            <ChevronDownIcon className={cn("size-4", className)} {...props} />
          )
        },
        DayButton: CalendarDayButton,
        WeekNumber: ({ week, ...props }) => (
          <td {...props}>
            <div className="flex size-(--cell-size) items-center justify-center text-center">
              {week.weekNumber}
            </div>
          </td>
        ),
        ...components,
      }}
      {...props}
    />
  )
}

function CalendarDayButton({
  className,
  day,
  modifiers,
  ...props
}: React.ComponentProps<typeof DayButton>) {
  const defaultClassNames = getDefaultClassNames()

  const ref = React.useRef<HTMLButtonElement>(null)
  React.useEffect(() => {
    if (modifiers.focused) ref.current?.focus()
  }, [modifiers.focused])

  return (
    <Button
      ref={ref}
      variant="ghost"
      size="icon"
      data-day={day.date.toLocaleDateString()}
      data-selected-single={
        modifiers.selected &&
        !modifiers.range_start &&
        !modifiers.range_end &&
        !modifiers.range_middle
      }
      data-range-start={modifiers.range_start}
      data-range-end={modifiers.range_end}
      data-range-middle={modifiers.range_middle}
      className={cn(
        "data-[selected-single=true]:bg-primary data-[selected-single=true]:text-primary-foreground data-[range-middle=true]:bg-accent data-[range-middle=true]:text-accent-foreground data-[range-start=true]:bg-primary data-[range-start=true]:text-primary-foreground data-[range-end=true]:bg-primary data-[range-end=true]:text-primary-foreground group-data-[focused=true]/day:border-ring group-data-[focused=true]/day:ring-ring/50 flex aspect-square size-auto w-full min-w-(--cell-size) flex-col gap-1 leading-none font-normal group-data-[focused=true]/day:relative group-data-[focused=true]/day:z-10 group-data-[focused=true]/day:ring-[3px] data-[range-end=true]:rounded-md data-[range-end=true]:rounded-r-md data-[range-middle=true]:rounded-none data-[range-start=true]:rounded-md data-[range-start=true]:rounded-l-md [&>span]:text-xs [&>span]:opacity-70",
        defaultClassNames.day,
        className
      )}
      {...props}
    />
  )
}

export { Calendar, CalendarDayButton }

Usage

import { useState } from "react"
import { Calendar } from "@/components/ui/calendar"

const [date, setDate] = useState<Date | undefined>(new Date())

<Calendar mode="single" selected={date} onSelect={setDate} className="rounded-md border" />

Built on react-day-picker. See also date picker for a composition with popover that turns the calendar into a text-input-style field.

API

Prop	Type	Default
`mode`	`single \| multiple \| range`	—
`selected` / `onSelect`	depends on `mode`	—
`captionLayout`	`label \| dropdown \| dropdown-months \| dropdown-years`	`label`
`buttonVariant`	button variant for the nav buttons	`ghost`
`showOutsideDays`	`boolean`	`true`
`numberOfMonths`	`number` — months to render side by side	`1`

All other react-day-picker DayPicker props are forwarded.

Examples

Range

Set mode="range" and hold a DateRange in state to pick a start and end day.

July 2026

August 2026

import * as React from "react"
import { type DateRange } from "react-day-picker"

import { Calendar } from "@/components/ui/calendar"

export default function CalendarRangeDemo() {
  const [range, setRange] = React.useState<DateRange | undefined>({
    from: new Date(),
    to: undefined,
  })

  return (
    <Calendar
      mode="range"
      selected={range}
      onSelect={setRange}
      numberOfMonths={2}
      className="rounded-md border"
    />
  )
}

Use captionLayout="dropdown" to switch months and years with select menus.

July 2026

import * as React from "react"

import { Calendar } from "@/components/ui/calendar"

export default function CalendarDropdownDemo() {
  const [date, setDate] = React.useState<Date | undefined>(new Date())

  return (
    <Calendar
      mode="single"
      selected={date}
      onSelect={setDate}
      captionLayout="dropdown"
      className="rounded-md border"
    />
  )
}

Su	Mo	Tu	We	Th	Fr	Sa

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Installation

Usage

API

Examples

Range

Dropdown caption