@dateforge/react-calendar

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A modular React calendar toolkit that starts tiny and grows with your product.

Monolithic pickers ship the grid, the toolbar, the time picker, the presets, the layout opinions — and all the weight. DateForge ships only what you use: every module is its own bundle on its own subpath, sharing one calendar core.

• Zero runtime dependencies. React 18/19 peer, nothing else.
• SSR-safe. No hydration mismatches — server render tested in CI.
• Accessible. Keyboard-first, roving focus, axe-audited, WCAG-checked contrast in every built-in theme.
• Themeable. 28 light/dark theme families, 8 appearances, gradient mode, or bring your own tokens.
• Pay per module. A minimal calendar stays around 20 KB min+gzip; size budgets are enforced in CI.

Install

npm i @dateforge/react-calendar

Styles ship with the components: with ESM (any bundler) the CSS is picked up automatically via the modules' own stylesheet imports. CJS consumers import the stylesheet once: import '@dateforge/react-calendar/style.css'.

10-second start

One import, zero composition:

import { useState } from "react";
import { SimpleCalendar } from "@dateforge/react-calendar/prebuilt";

export function Example() {
  const [date, setDate] = useState<Date | null>(null);
  return <SimpleCalendar value={date} onChange={setDate} />;
}

Prebuilt gallery

Every prebuilt is a ready recipe over the same primitives, with plain-Date props (value, defaultValue, onChange, locale, min/max, disabled, theme, appearance, gradient, scheme):

import {
  DatePicker,
  MonthPicker,
  MultiMonthCalendar,
  SimpleCalendar,
} from "@dateforge/react-calendar/prebuilt";

<SimpleCalendar onChange={setDate} />                      // header + day grid
<DatePicker allowClear onChange={setDate} />               // typed input + grid + Today
<MonthPicker onChange={setMonth} />                        // year stepper + 12-month grid
<MultiMonthCalendar months={6} cols={3} mode="range" />    // 6-month range board

Compose your own

When a prebuilt stops fitting, drop one level down: Calendar takes a compiled config (from createCalendarConfig) and any mix of modules as children. The root is a CSS grid — cols on the root declares columns, col on a module places it.

import {
  Calendar,
  commonPresets,
  createCalendarConfig,
} from "@dateforge/react-calendar";
import { CalendarDays } from "@dateforge/react-calendar/modules/days";
import { CalendarPresets } from "@dateforge/react-calendar/modules/presets";
import {
  CalendarToolbar,
  CalendarToolbarMonthTrigger,
  CalendarToolbarNext,
  CalendarToolbarPrev,
  CalendarToolbarYearTrigger,
} from "@dateforge/react-calendar/modules/toolbar";

const config = createCalendarConfig({
  mode: "range",
  locale: "de-DE",
  disabled: { weekends: true },
});

export function BookingCalendar() {
  return (
    <Calendar
      config={config}
      cols={3}
      onChange={(range) => console.log(range)} // { start: Date, end: Date } | null
    >
      <CalendarToolbar>
        <CalendarToolbarPrev />
        <CalendarToolbarMonthTrigger />
        <CalendarToolbarYearTrigger />
        <CalendarToolbarNext />
      </CalendarToolbar>
      <CalendarPresets col={1} presets={commonPresets} />
      <CalendarDays col={2} />
    </Calendar>
  );
}

Remove a line, remove a feature. Add a module, add a workflow. Order in JSX is visual flow — no order props, no slots.

The onChange value shape is derived from unit × mode alone: day+single → Date | null, day+multiple → Date[], any single span (range, or week/month single) → { start, end } | null, any multi span → { start, end }[].

Modules

Import from @dateforge/react-calendar/modules, or per subpath (…/modules/days, …/modules/toolbar, …) for the smallest possible bundle.

Module	Use it for
CalendarToolbar + primitives	Composable header: prev/next (unit-aware), month/year triggers and labels, Home, Apply, clock
CalendarDays	Classic month grid — single, multiple, range, multi-range; offset for multi-month boards
CalendarMonthsGrid / CalendarYearsGrid	Month/year picking or fast jumps
CalendarDaysTrack / CalendarMonthsTrack / CalendarYearsTrack	Physics-based scrollable strips for compact and mobile layouts
CalendarTimeWheel / CalendarMonthsWheel / CalendarYearsWheel	iOS-style drum pickers, range-bound aware (bound="from" | "to")
CalendarManualInput	Typed, segment-based date entry with keyboard stepping
CalendarPresets	Shortcuts — commonPresets, relativePresets, or definePreset your own
CalendarSelectedDates	Selected-date chips with overflow and per-chip clear
CalendarInfo	Selection metrics, relative hints, empty text
CalendarLunar	Information-only lunar phase strip

Features

• Selection axes — mode: single / multiple / range / multi-range × unit: day / week / month. Plus minSpan/maxSpan, maxDates, maxRanges.
• Disabled vs excluded — disabled days can't be picked; exclude days are cut out of emitted spans (business-day flows), with segments reported in change details.
• 28 theme families — each with light + dark: abyss, aurora, bauhaus, chalk, crimson, cyber, dracula, eclipse, espresso, fjord, graphite, industrial, meadow, mint, monsoon, nebula, neon, noir, pearl, prism, riso, sandstone, slate, snow, solar, split, temporal, velvet.
• 8 appearances (shape/spacing, independent of color): zenith, airy, bubble, compact, loft, press, soft, square.
• Gradient mode — gradient on the root adds corner glows and gradient selected fills, pure CSS, theme-driven.
• Scheme control — scheme="auto" | "light" | "dark", controllable via onSchemeChange; no dark-mode flash on SSR.
• Locales via Intl — month/weekday names, digits, and week start derive from any BCP-47 locale; no locale files to import.
• RTL — logical properties throughout; the calendar follows the inherited dir.
• Time — withTime, 12/24-hour, ampmLabels, defaultTime, and a minTime/maxTime window enforced by the core.
• Time zones & DST — IANA timeZone for "today" resolution, with explicit ambiguous/nonexistent-time policies.
• Presets — built-in packs plus definePreset with validation context (disabled/min/max aware).
• Accessibility — full keyboard navigation, focus management, live announcements, axe test suite in CI.
• Validation hooks — onValidationReject tells you what was refused and why; onViewChange tracks navigation.

Theming in one minute

import { Calendar, createTheme } from "@dateforge/react-calendar";
import { nebula } from "@dateforge/react-calendar/themes";
import { compact } from "@dateforge/react-calendar/appearances";

// Built-in: by name (generated stylesheet) or by object (tree-shaken)
<Calendar config={config} theme="dracula" />
<Calendar config={config} theme={nebula} appearance={compact} scheme="dark" />

// Custom: common tokens + per-mode overrides → a light/dark family
const brand = createTheme({
  accent: "#2563eb",
  range: "#22c55e",
  light: { backdrop: "#f8fafc" },
  dark: { backdrop: "#0f172a", text: "#f8fafc" },
});
<Calendar config={config} theme={brand} />

Bundle size

Budgets from .size-limit.json, min+gzip, enforced on every commit (React excluded):

Import	Budget
Calendar only	< 18 KB
Calendar + CalendarDays	< 21.5 KB
Calendar + CalendarDays + theme + appearance	< 25.5 KB
Calendar + Toolbar + CalendarDays	< 26 KB
SimpleCalendar (prebuilt, one import)	< 27 KB

Dual ESM/CJS, sideEffects limited to CSS, subpath exports per module — bundlers drop everything you don't touch.

Migrating from v2

v3 is a clean rebuild. The three headline breaking changes:

• Config object instead of flat props. <Calendar mode locale min …> became createCalendarConfig({ mode, locale, min, … }) passed as one config prop — compiled once, shared by every module.
• Value shapes by unit × mode. onChange shapes are fully determined by the config's unit and mode (see above); segments and reasons arrive in a second details argument.
• Themes are families only. Every theme is a { light, dark } pair; the v1 single-variant palettes are gone, createTheme always returns a family.

Prefer not to migrate composition code by hand? The prebuilt components cover the common v2 setups with one import. Full details in DOCUMENTATION.md.

Links

• 📚 Repo Documentation
• 🏛 Architecture
• 📝 Changelog
• 📚 Storybook
• 🐛 Issues

License

MIT © Kirilinsky