# Date Reel (Notchset): prompt.md (v1.0.0)

- id: `date-reel` · version 1.0.0 · component · pro (Pro)
- category: Inputs
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/date-reel`
- npm dependencies: none
- registry dependencies: utils, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/date-reel
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

Day, hour and minute reels that snap behind one ink band, fading with distance, as keyboard spinbuttons that skip past times with a signal nudge, under a rolling readout.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: none beyond React.
- Files: `components/ui/notchset/date-reel.tsx`; shared code: `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`, `lib/beautiful-ui/notchset/calendar.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-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: `DateReel`, and every exported type.
- CSS: the install adds the notchset foundation (tokens, keyframes, motion levels) to your global stylesheet 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 `--notchset-*` custom properties (`--notchset-check`, `--notchset-control-edge`, `--notchset-draw-from`, `--notchset-ease-bloom`, `--notchset-ease-travel`, `--notchset-fade`, `--notchset-focus-color`, `--notchset-focus-inset`, `--notchset-life-from`, `--notchset-life-ms`, `--notchset-node-blink`, `--notchset-node-bloom`, `--notchset-node-delay`, `--notchset-plate-color`, `--notchset-rise-from`, `--notchset-rule`, `--notchset-scroll`, `--notchset-signal`, `--notchset-sweep-to`). Never add Tailwind colour classes inside the component.

```tsx
import { DateReel } from "@/components/ui/notchset/date-reel";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `DateReel` | `date-reel` | Readout, reels and actions. |

Style a part with `[data-slot="<slot>"]` selectors or its `className`; keep the attributes when editing.

## 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 `SoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/notchset-sound.json`, import from `@/components/ui/notchset/sound-provider`); `useSound()` gives `muted` and `setMuted` for a mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/notchset/date-reel.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, time picker, reel, scheduler, send later, spinbutton, Notchset
- Picking a near-future time, like send later

### Not when
- Far dates: use Date Picker

## Mistakes
- Times are UTC; convert before display elsewhere

## Usage

```tsx
"use client";

import * as React from "react";
import { DateReel } from "@/components/ui/notchset/date-reel";

export function SendLater({ schedule }: { schedule: (when: Date) => Promise<void> }) {
  const [now] = React.useState(() => new Date());
  const [when, setWhen] = React.useState<Date | undefined>();
  return (
    <div className="grid gap-2">
      <DateReel now={now} onValueChange={setWhen} onSchedule={schedule} />
      <span className="font-mono text-xs">{when ? `SENDS ${when.toUTCString()}` : "PICK A TIME"}</span>
    </div>
  );
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `now` | `Date` |  | Earlier times are skipped. |
| `value / defaultValue / onValueChange` | `Date` |  | Controlled or not. |
| `days / minuteStep / presets / onSchedule` | `number / number / { label, value }[] / (d) => void` |  | Range, step, chips and SCHEDULE. |

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

## Customising
- Colours: the component reads your shadcn tokens (`--background`, `--foreground`, `--border` …), refined by the `--notchset-*` tokens. The signal colour is `--notchset-signal` (it falls back to `--destructive`). Set tokens on `:root`, or on any container to retheme one area.
- 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 |
|---|---|
| ↑ ↓ | Step a row |
| PgUp / PgDn | Step 5 |
| Home / End | First / last |
| Enter | Schedule |

## Performance

- Fades update once per scroll frame.

## Responsive

- The day reel flexes; hour and minute are 64px.

## Motion inventory

| Interaction | What moves |
|---|---|
| Scroll | Snap with scroll-snap; rows fade and shrink with distance |
| Past time | The band flashes signal and the reels move on |

## Accessibility contract (preserve when editing)
- Each reel is a spinbutton with value text; the nudge is announced politely

## Install

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

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)

The notchset 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/notchset-foundation.json.