# Calendar

A date picker for selecting single dates, ranges, or multiple dates.

## Installation

Start from a Svelte 5 application, then install the component package, shared theme, and Bits UI peer:

```bash
pnpm add coss-svelte @coss-svelte/theme bits-ui
```

Import `@coss-svelte/theme/style-coss.css` after Tailwind from the application's global stylesheet.

## Usage

```svelte
<script lang="ts">
import { getLocalTimeZone, today } from "@internationalized/date";
import { Calendar } from "coss-svelte";

let value = $state(today(getLocalTimeZone()));
</script>

<Calendar bind:value />

```

## Anatomy

- `Calendar`

## API Reference

### Calendar

A date picker for selecting single dates, ranges, or multiple dates.

**Signatures**

- `{ type?: "single"; value?: CalendarValue; onValueChange?: OnChangeFn<DateValue \| undefined> }`
- `{ type: "multiple"; value?: CalendarValue[]; onValueChange?: OnChangeFn<DateValue[]> }`

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `type` | `"single" \| "multiple"` | `"single"` | Behavior, selection, or HTML type passed to the underlying control. |
| `bind:value` | `CalendarValue \| CalendarValue[]` | - | Current value for the component. Bind with `bind:value` when supported. |

**Composition and refs**

- `children: Snippet<[CalendarRootSnippetProps]>`
- `bind:ref: HTMLElement \| null`

Inherits from [Bits UI Calendar.Root](https://bits-ui.com/docs/components/calendar#root).

## Implementation Details

| Field | Value |
| --- | --- |
| Status | Stable |
| Foundation | bits |
| Category | Selection & Input |
| Particles | 24 |

## Status

Stable for the current coss-svelte surface.

## Agent Notes

- Import Svelte exports directly from `coss-svelte`.
- This is Svelte 5 code: use `class`, lowercase event properties, runes, snippets, and documented `bind:*` contracts. Do not emit JSX, React hooks, `className`, `asChild`, or Base UI imports.
- Prefer this route's example and generated API table over React COSS snippets; COSS React particles are design references only.
- The copy-and-own registry is a preview. Inspect `/r/calendar.json` for the complete local file and dependency closure.
- Calendar is stable in the current source catalog.