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Measured entry

shadcn-block-calendar-12

calendarminimal-flat

A client-side appointment date-range calendar with an English and Spanish language switcher, localized labels, and internal React state. It ships as a shadcn registry block composed from Calendar, Card, and Select components, backed by React Day Picker, date-fns, and Radix primitives.

Specimen
Harness screenshot of shadcn-block-calendar-12 at 375 pixels wide
Harness screenshot at 375 pixels wide. No horizontal overflow recorded.
Harness screenshot of shadcn-block-calendar-12 at 768 pixels wide
Harness screenshot at 768 pixels wide. No horizontal overflow recorded.
Harness screenshot of shadcn-block-calendar-12 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-12
BuildOK
MountOK
Console errors0
Uncaught page errors0
Horizontal overflowclean at 375, 768, 1440
Axe critical1
Axe serious0
Axe moderate0
Axe minor0
Gzip marginal82.9 KB (148.3 KB build, 65.4 KB baseline)
Bare modeFAIL
Provider requiredNO
Demo usednone

What the harness recorded

BARE BUILD

✗ Build failed in 40.22s
error during build:
[vite:load-fallback] Could not load <sandbox>/src/lib/utils (imported by src/components/ui/card.tsx): ENOENT: no such file or directory, open '<sandbox>/src/lib/utils'

Verdict

It builds and mounts in the prepared harness, but the unnamed calendar button is an accessibility release blocker. It also needs a shadcn-style setup and carries a sizable date-picker footprint, so use it as a starting block rather than a drop-in booking feature.

Use it if

  • You need a date-range appointment picker with English and Spanish copy already wired together.
  • Your app already uses shadcn component conventions, aliases, utility classes, and registry primitives.
  • You want the chosen range managed locally and can connect it to your own booking flow.

Skip it if

  • You need a drop-in component for a plain React project with no shadcn foundation.
  • Your release cannot accept an unnamed calendar button until its accessible name is fixed.
  • You need server-owned selection state, availability rules, time slots, or booking submission out of the box.
  • You are minimizing client bundle cost and do not otherwise need a full date-picker stack.

Install

Installation record for shadcn-block-calendar-12
Declared dependenciesreact-day-picker@latest, date-fns, @radix-ui/react-slot, @radix-ui/react-select
Missing on installnone
Bare installfails once the shadcn-style helpers are removed, so it needs that setup
Providerno provider required in the harness

A non-shadcn project must add the source alias, the shared class-name utility, Tailwind theme and component styles, and compatible Calendar, Card, and Select implementations. It must also install React Day Picker, date-fns, Radix Slot, and Radix Select, then give every calendar button an accessible name.

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.