# Date Picker (Lumen Halo): prompt.md (v1.0.0)

- id: `lumen-date-picker` · version 1.0.0 · component · pro (All-Access)
- category: Inputs
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/lumen-date-picker`
- npm dependencies: react-day-picker@^10
- registry dependencies: utils, @beautiful-ui-pro/lumen-calendar, @beautiful-ui-pro/lumen-popover, https://beautiful-ui.dev/r/lumen-foundation.json
- docs: https://beautiful-ui.dev/components/lumen-date-picker
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

A date, or a range, in Lumen's recessed well: it opens the Calendar in smoked glass, names the dates in the reader's own locale, and the range version adds presets on the side and closes once both ends are picked.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: `react-day-picker@^10`.
- Files: `components/ui/lumen/controls/date-picker.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `lumen-calendar`, `lumen-popover`, `lumen-foundation`.
- Builds: one set of files for both, but its dependencies come in Base UI and Radix builds. Install the one that matches the project (see Install): a free item's bare URL installs the Base UI build of it and its dependencies.
- Exports to keep: `DatePicker`, `DateRangePicker`, and every exported type.
- CSS: the install merges this item's rules (the registry `css` field) into your global stylesheet, in `@layer components`, and adds the lumen foundation (tokens, keyframes, motion levels) once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Tokens: retheme with the `--lumen-*` custom properties (`--lumen-accent`, `--lumen-accent-text`, `--lumen-bad`, `--lumen-bad-text`, `--lumen-focus`, `--lumen-good`, `--lumen-good-text`, `--lumen-hairline`, `--lumen-ink`, `--lumen-muted-ink`, `--lumen-series-1`, `--lumen-series-2`, `--lumen-series-3`, `--lumen-series-4`, `--lumen-series-5`, `--lumen-series-6`, `--lumen-warn`, `--lumen-warn-text`); this item's CSS also reads `--lumen-font-sans`, `--lumen-radius-k`. Never add Tailwind colour classes inside the component.

```tsx
import { DatePicker, DateRangePicker } from "@/components/ui/lumen/controls/date-picker";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `DatePicker` | — | One date. |
| `DateRangePicker` | — | A range, with presets. |

## Sound
- Keep every `data-slot` and `data-sound` attribute: the sound layer reads them.
- Installing this item adds no audio. Nothing plays until the app mounts `GlassSoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/glass-sound.json`, import from `@/components/beautiful-ui/glass-sound`); `GlassSoundToggle` is its mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/lumen/controls/date-picker.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when
- date picker, date range picker, pick a date, choose dates, booking dates, due date, report period, Lumen
- A form field for one date (a due date, a start date)
- A range with shortcuts (Last 7 days, This month)

### Not when
- Reporting periods compared with the one before: use Date Compare
- A date far away (birthdays): type it in an Input

## Mistakes
- Give presets the exact ranges they name, inclusive of today
- Disable days that make no sense for the field

## Usage

```tsx
import { DatePicker, DateRangePicker } from "@/components/ui/lumen/controls/date-picker";

<DatePicker value={due} onValueChange={setDue} calendar={{ disabled: { before: new Date() } }} />
<DateRangePicker value={range} onValueChange={setRange} presets={[{ label: "Last 7 days", range: { from: subDays(today, 6), to: today } }]} />
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `value / defaultValue / onValueChange` | `Date \| undefined` |  | DatePicker: controlled or not. |
| `DateRangePicker value / onValueChange` | `DateRange \| undefined` |  | { from, to } from react-day-picker. |
| `presets` | `{ label, range }[]` |  | DateRangePicker: shortcuts beside the calendar. |
| `numberOfMonths` | `number` | `2` | DateRangePicker: months shown. |
| `calendar` | `Calendar props` |  | Disabled days, caption layout, time zone … |
| `locale` | `string` |  | BCP 47 locale for the trigger's words. |

Full docs: https://beautiful-ui.dev/components/lumen-date-picker

## Customising
- Colours: set the `--lumen-*` tokens on `:root`, or on a container with the `lumen-scope` class to retheme one area. Add the `lumen-inherit` class to follow your shadcn palette instead (`--chart-N`, `--destructive`).
- Dark mode follows the `.dark` class on an ancestor (the shadcn and next-themes convention).
- Update later by re-running the install with `--overwrite` (review the diff if you edited it). Changelog: https://beautiful-ui.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| Enter / Space | Open |
| Arrows | Move through days |
| Escape | Close |

## Motion inventory

| Interaction | What moves |
|---|---|
| Open | The popover grows from the trigger |

## Accessibility contract (preserve when editing)
- The trigger is a button that names the chosen date
- The calendar is a keyboard grid; Escape returns focus to the trigger

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/lumen-date-picker
```

Pro item: needs the `@beautiful-ui-pro` registry in `components.json` and `BEAUTIFUL_UI_TOKEN` in `.env.local` (https://beautiful-ui.dev/account). Setup: https://beautiful-ui.dev/docs/pro. Your components.json `style` picks the build: radix-*, new-york and default get Radix, base-* gets Base UI.

## Credits
- Built on shadcn/ui (https://ui.shadcn.com)
- react-day-picker (https://daypicker.dev)

The lumen foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://beautiful-ui.dev/r/lumen-foundation.json.