# P calendar 12

> Calendar with week numbers

A shadcn/ui block from the [@coss](https://coss.com/ui) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/coss/p-calendar-12).

- Page, with a live preview: https://shadcn.exchange/r/coss/p-calendar-12
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/coss/p-calendar-12-light-0b85bc8196de4d1d.png
- Registry item: https://coss.com/ui/r/p-calendar-12.json
- Categories: calendar
- Listed: 2026-10-13, source last changed 2026-10-13

## Install

```bash
npx shadcn@latest add https://coss.com/ui/r/p-calendar-12.json
```

Run it in a project that has shadcn/ui set up. It adds the files below and installs what they depend on.

## Dependencies

- Registry items: `@coss/calendar`

## Files

### `registry/default/particles/p-calendar-12.tsx`

```tsx
"use client";

import type { WeekNumberProps } from "@daypicker/react";
import { useState } from "react";
import { Calendar } from "@/registry/default/ui/calendar";

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

  return (
    <Calendar
      components={{
        WeekNumber: ({ week, ...props }: WeekNumberProps) => {
          return (
            <th {...props}>
              <span className="inline-flex size-(--cell-size) items-center justify-center">
                {week.weekNumber}
              </span>
            </th>
          );
        },
      }}
      fixedWeeks
      mode="single"
      onSelect={setDate}
      selected={date}
      showWeekNumber
    />
  );
}
```