ilamy Calendar

A powerful, full-featured yet lightweight and highly pluggable React calendar component library built with TypeScript, Tailwind CSS 4, and shadcn/ui. The core is small — ~40 KB minified (≈13 KB gzipped) — with opt-in plugins for recurring events, agenda views, and more, so you only ship what you use. Built for high-performance scheduling with RFC 5545 recurring events, resource management, and drag-and-drop interactions.

Support

ilamy Calendar is free and open source. If you'd like to support its development:

Features

Core Views

• Multiple Perspectives: Month, Week, Day, and Year views.
• Fluid Navigation: Smooth transitions between dates and views.
• Business Hours: Customizable working hours with support for split shifts.

Resource Management

• Resource Timeline: Visualize and manage events across multiple resources (rooms, people, equipment).
• Vertical & Horizontal Layouts: Flexible resource views to fit any application design.
• Resource-Aware Validation: Ensure events are correctly assigned and don't overlap where prohibited.

Recurring Events (RFC 5545)

Opt-in via the recurrence plugin (plugins={[recurrencePlugin()]} from @ilamy/calendar/plugins/recurrence).

• Full RRULE Support: Daily, Weekly, Monthly, Yearly patterns with complex frequencies.
• Smart CRUD: Google Calendar-style operations—edit "this event", "this and following", or "all events".
• Exclusion Dates: Robust handling of EXDATE and modified instances within a series.
• iCalendar Export: Export events to .ics files with strict RFC 5545 compliance.

Plugin System

• Opt-in capabilities: The core ships no plugins. Add behavior through the plugins prop, each from its own subpath: @ilamy/calendar/plugins/recurrence (RFC 5545 recurring events) and @ilamy/calendar/plugins/agenda (agenda list view).

Internationalization & Timezones

• Timezones: Full timezone support via dayjs.tz with automatic DST handling.
• Internationalization: Support for 100+ locales with configurable week start days.

Interactions

• Drag & Drop: Move and resize events with precision using @dnd-kit.
• Responsive: Adaptive layouts designed for desktop, tablet, and mobile.

Developer Experience

• Type Safety: Written in TypeScript with comprehensive type definitions and IntelliSense support.
• Reliability: 100% test coverage for all mission-critical date and recurrence logic.
• Theming: Built on Tailwind CSS 4 variables for effortless branding and customization.
• Modern Stack: Zero-config integration with React 19 and modern build tools.

Installation

Install the library and its peer dependencies using your preferred package manager:

# npm
npm install @ilamy/calendar dayjs

# bun
bun add @ilamy/calendar dayjs

# pnpm
pnpm add @ilamy/calendar dayjs

Note: This library requires React 19+ and Tailwind CSS 4+. Peers: dayjs, react, react-dom, tailwindcss (v4), tailwindcss-animate. dayjs is in the command above because the calendar's API uses dayjs objects and shares your app's instance/locale.

Quick Start

import { IlamyCalendar } from '@ilamy/calendar';

const MyApp = () => {
  const events = [
    {
      id: '1',
      title: 'Project Kickoff',
      start: '2026-05-01T10:00:00Z',
      end: '2026-05-01T11:30:00Z',
      color: 'blue'
    }
  ];

  return (
    <div style={{ height: '800px' }}>
      <IlamyCalendar 
        events={events}
        initialView="week"
        onEventClick={(event) => console.log('Clicked:', event)}
      />
    </div>
  );
};

Styling — bring your own design system

@ilamy/calendar ships no CSS. Components use the conventional shadcn/ui token classes (bg-background, text-muted-foreground, bg-primary, border-border, …), so your design system supplies the look. Point Tailwind at the package so it generates the utilities (Tailwind v4 ignores node_modules by default — adjust the relative depth to your stylesheet):

@source "../node_modules/@ilamy/calendar/dist";

If you already use shadcn, the tokens are defined and you're done. Otherwise, define the standard shadcn theme tokens (--background, --primary, --border, --ring, --card, …) so the calendar inherits your palette.

Plugins

The core ships no plugins. Add capabilities through the plugins prop, each imported from its own subpath:

import { IlamyCalendar } from '@ilamy/calendar';
import { recurrencePlugin } from '@ilamy/calendar/plugins/recurrence';
import { agendaPlugin } from '@ilamy/calendar/plugins/agenda';

<IlamyCalendar
  events={events}
  plugins={[recurrencePlugin(), agendaPlugin({ window: 'week' })]}
/>

• @ilamy/calendar/plugins/recurrence — RFC 5545 recurring-event expansion and scoped edit/delete. Also re-adds rrule/recurrenceId/exdates to CalendarEvent.
• @ilamy/calendar/plugins/agenda — an agenda (upcoming-events list) view scoped to a window.

Examples

Explore the examples directory for complete implementation patterns:

• Next.js - Integration with Next.js and Tailwind CSS.
• Astro - Static site integration with Astro.
• Vite - Fast, minimal setup using Vite.

Documentation

For comprehensive guides, API references, and interactive demos, visit ilamy.dev.

License

MIT © Sujeet Kc