# bigcalendar/react-big-calendar

gcal/outlook like calendar component

Repository: https://github.com/bigcalendar/react-big-calendar
Canonical: https://ross.abutalabs.com/products/react-big-calendar
Homepage: http://bigcalendar.github.io/react-big-calendar/
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2026-06-01T02:34:37+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 85, release rhythm 86, longevity 100
- inputs: {"age_days": 4029, "days_push": 94, "days_rel": 94, "gap_med": 5.5, "n_releases_24m": 17}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8747, forks 2301 (observed 2026-08-28T04:10:25.529643+00:00)

## What it is
react-big-calendar is a React events calendar component styled like Google Calendar or Outlook, built with flexbox for modern browsers. It requires a pluggable date localizer (Moment.js, date-fns, Day.js, or Globalize.js) for formatting and localization.

## Use cases
- add a google calendar-like event calendar to a react app
- display weekly and monthly event schedules in react
- build a booking calendar with drag and drop events
- render an outlook-style calendar view in a web app
- show localized event calendars with custom date formatting

## When to choose
- you need a full-featured, customizable calendar component in a React project
- you want Google Calendar/Outlook-like month, week, and day views out of the box
- you need flexible localization via your preferred date library

## When to avoid
- your project does not use React
- you need a full scheduling backend with reminders and sync to external calendar services
- you need IE11 support

## Facets
- artifact type: library
- maturity: stable
- function: ui-components, date-time, frontend-framework
- domain: web-development, frontend, developer-tools
- platform: cross-platform
- tags: react, calendar, events, scheduling, gcal-like, web-server, nodejs

## Member repositories
- bigcalendar/react-big-calendar (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:25.529643+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:25:16.873145+00:00, confidence not recorded.
  - readme: https://github.com/bigcalendar/react-big-calendar (fetched 2026-08-28T04:10:25.529643+00:00, sha 54ba5865e7e7)
  - homepage: http://bigcalendar.github.io/react-big-calendar/ (fetched 2026-08-29T08:25:47.474973+00:00, sha e2fbed70c055)
- Data as of 2026-08-30T08:39:29.467469+00:00.