Files
a75a3b22b6 fix(studio): align PITR calendar dates in the first week (#47806)
## What

Fixes misaligned day cells in the PITR calendar widget for the first
week of the month.

## Why

The PITR calendar draws a \`border\` on each day cell via
\`classNames.day\`. The day \`<td>\` has no explicit width, so
\`box-sizing: border-box\` doesn't apply and the 1px borders add to its
size (36px → 38px), while the weekday header cells stay pinned at
\`w-9\` (36px). Bordered day cells therefore drift right of their
headers, which is most visible in the first partial week where
unbordered leading cells sit flush next to the wider bordered ones.

## How

Pin each day cell to a fixed \`w-9 box-border\` so the border is drawn
inside the 36px box, and let the day button fill the cell (\`w-full\`).
Column pitch now matches the weekday headers regardless of border state.

Class-only change, no logic touched.

Closes FE-3886

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Style**
* Improved calendar day cell sizing and layout for more consistent
rendering.
* Ensured day buttons use full-width styling where applicable, while
preserving existing hover, border, background, and corner behavior.
* **Documentation**
* Added documentation for “Calendar with disabled days,” including a new
interactive preview.
* **New Features**
* Introduced a calendar example demonstrating disabled-day behavior with
mid-week month start and restricted date selection.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Joshen Lim <joshenlimek@gmail.com>
Co-authored-by: Ivan Vasilov <vasilov.ivan@gmail.com>
2026-07-10 11:40:33 +01:00

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---
title: Calendar
description: A date field component that allows users to enter and edit date.
component: true
links:
doc: https://react-day-picker.js.org
source:
shadcn: true
---
<ComponentPreview name="calendar-demo" peekCode wide />
## About
The `Calendar` component is built on top of [React DayPicker](https://react-day-picker.js.org).
## Installation
<Tabs defaultValue="cli">
<TabsList>
<TabsTrigger value="cli">CLI</TabsTrigger>
<TabsTrigger value="manual">Manual</TabsTrigger>
</TabsList>
<TabsContent value="cli">
```bash
npx shadcn-ui@latest add calendar
```
</TabsContent>
<TabsContent value="manual">
<Steps>
<Step>Install the following dependencies:</Step>
```bash
npm install react-day-picker date-fns
```
<Step>Add the `Button` component to your project.</Step>
The `Calendar` component uses the `Button` component. Make sure you have it installed in your project.
<Step>Copy and paste the following code into your project.</Step>
<ComponentSource name="calendar" />
<Step>Update the import paths to match your project setup.</Step>
</Steps>
</TabsContent>
</Tabs>
## Usage
```tsx
import { Calendar } from '@/components/ui/calendar'
```
```tsx
const [date, setDate] = React.useState<Date | undefined>(new Date())
return <Calendar mode="single" selected={date} onSelect={setDate} className="rounded-md border" />
```
See the [React DayPicker](https://react-day-picker.js.org) documentation for more information.
## Date Picker
You can use the `<Calendar>` component to build a date picker. See the [Date Picker](/docs/components/date-picker) page for more information.
## Examples
### Form
<ComponentPreview name="calendar-form" />
### Calendar with disabled days
Shows a calendar with disabled days for selection. The current month starts mid week.
<ComponentPreview name="calendar-disabled-days-demo" />