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Measured entry

shadcn-block-calendar-01

calendarminimal-flat

A client-side React single-date calendar example shipped as a shadcn registry block. It wraps the shared Calendar and Button components built on react-day-picker, with date-fns, Lucide icons, Radix Slot, Tailwind theme classes, and the shadcn cn utility in the dependency chain.

Specimen
Harness screenshot of shadcn-block-calendar-01 at 375 pixels wide
Harness screenshot at 375 pixels wide. No horizontal overflow recorded.
Harness screenshot of shadcn-block-calendar-01 at 768 pixels wide
Harness screenshot at 768 pixels wide. No horizontal overflow recorded.
Harness screenshot of shadcn-block-calendar-01 at 1440 pixels wide
Harness screenshot at 1440 pixels wide. No horizontal overflow recorded.

Measured

Every value below was written by the harness on the run that produced the frames above. None of it is derived from the prose.

Harness measurements recorded for shadcn-block-calendar-01
BuildOK
MountOK
Console errors0
Uncaught page errors0
Horizontal overflowclean at 375, 768, 1440
Axe critical0
Axe serious0
Axe moderate0
Axe minor0
Gzip marginal50.8 KB (116.2 KB build, 65.4 KB baseline)
Bare modeFAIL
Provider requiredNO
Demo usednone

What the harness recorded

BARE BUILD

✗ Build failed in 34.03s
error during build:
[vite:load-fallback] Could not load <sandbox>/src/lib/utils (imported by src/components/ui/calendar.tsx): ENOENT: no such file or directory, open '<sandbox>/src/lib/utils'

Verdict

A solid fit inside an existing shadcn application: it builds, mounts, stays contained across the tested layouts, and passed the accessibility scan. It is not drop-in for a bare React app and needs a shadcn-style setup, including shared utilities and primitives.

Use it if

  • You need an inline single-date picker with controlled React state.
  • Your app already uses shadcn conventions, Tailwind theme tokens, and shared Button primitives.
  • You want a react-day-picker base that can later support ranges, disabled dates, or custom captions.

Skip it if

  • A native date input is sufficient and adding a calendar library would be unnecessary.
  • Your project does not use Tailwind or shadcn theme tokens and you do not want to translate its styling.
  • You need scheduling, time selection, events, or form validation without building that behavior around this picker.
  • Your dependency budget is tight for a single-date control.

Install

Installation record for shadcn-block-calendar-01
Declared dependenciesreact-day-picker@latest, date-fns, @radix-ui/react-slot
Missing on installnone
Bare installfails once the shadcn-style helpers are removed, so it needs that setup
Providerno provider required in the harness

In a non-shadcn project, add react-day-picker, date-fns, Lucide React, Radix Slot, the shared Button primitive, a class-name merge helper matching cn, and Tailwind styles that define the referenced theme tokens. Update the registry aliases to your local paths and ensure the file runs as a client component.

Source and credit

This page is a review, not a copy. The component source lives with its author and this site does not republish it. Read the license before you use anything.

Author repository

github.com/shadcn-ui/ui
License
MIT
Record published
2026-08-14

Alternatives

Other published entries for the calendar pattern, ordered by what they measured: mounts first, then clean axe scans, then bare-mode passes, then the smaller bundle.