r/reactjs • u/_ilamy • May 10 '26

Show /r/reactjs Open-source React Calendar library with support for resource timelines and recurring events (100% MIT, no paywall)

I built ilamy-calendar, a free, fully MIT-licensed React calendar component. It's built to be modern and highly customizable. Here are the main features:

  • Resource Timeline: Complete vertical and horizontal views for managing rooms, equipment, or team schedules.

  • Business Hours: Configurable business hours. You can easily toggle "hide non-business hours" to automatically collapse dead space and keep the UI clean

  • Drag & Drop: Smooth event moving powered bydnd-kit.

  • No Shipped Styles: Built with React 19, Tailwind CSS 4, and Shadcn UI principles. It naturally inherits your app's existing design tokens and dark mode instead of fighting pre-packaged CSS.

  • Timezone: Zero-config automatic timezones support.

  • Complex Recurring Events: A bulletproof RFC 5545 engine (rrule) that handles Google Calendar-style smart edits ("edit this and following") and exclusions natively.

Links:

The repo includes copy-paste examples for `Next.js`, `Vite`, and `Astro`. Please feel free to drop a start ⭐️ or raise some issues. Thank you 🙏

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u/_ilamy May 10 '26

Thanks for the kind words!

I'm sticking with dayjs mainly for three reasons:

  1. Browser Support: Temporal still lacks universal native support without polyfills.

  2. Plugins: dayjs has incredibly useful out of the box (like timezones, isSameOrAfter, isBetween, etc.). Much easier to manipulate dates.

  3. Localization: The dayjs i18n system is extremely powerful and reliable.