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https://github.com/acamarata/temporal-hijri.git
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4dd246f27a
HijriCalendar.toHijri() previously used new Date(y, m, d) (local-time constructor). Under hijri-core's new UTC-day contract the engine reads the UTC calendar day, so on east-of-UTC hosts (e.g. UTC+5) the local midnight falls on the previous UTC date, producing a one-day-off Hijri result. Fix: use Date.UTC(y, m, d) so PlainDate calendar fields land in the Date's UTC components, matching what hijri-core reads. Lock-step dependency: this fix requires the unreleased hijri-core change on fix/utc-day-boundary (commit 3419378). Both packages will be released together per ADR-013. Tests: round-trip regression added (2025-03-01 = 1 Ramadan 1446 AH); all 37 ESM + 9 CJS tests pass at TZ=UTC, TZ=America/New_York, TZ=Pacific/Auckland.
78 lines
3.2 KiB
Markdown
78 lines
3.2 KiB
Markdown
[](https://www.npmjs.com/package/temporal-hijri)
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[](https://github.com/acamarata/temporal-hijri/actions/workflows/ci.yml)
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[](LICENSE)
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# temporal-hijri
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Temporal Calendar Protocol implementation for the Hijri calendar. Works with the TC39
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Temporal proposal (Stage 3) and `@js-temporal/polyfill`.
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Provides `UaqCalendar` (Umm al-Qura) and `FcnaCalendar` (FCNA/ISNA) as plug-in
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calendars for `Temporal.PlainDate`. The underlying conversion logic comes from
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[hijri-core](https://github.com/acamarata/hijri-core).
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## Installation
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```bash
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pnpm add temporal-hijri hijri-core
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# Add the polyfill if native Temporal is unavailable:
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pnpm add @js-temporal/polyfill
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```
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## Quick Start
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```typescript
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import { Temporal } from '@js-temporal/polyfill';
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import { uaqCalendar } from 'temporal-hijri';
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const isoDate = Temporal.PlainDate.from('2023-03-23');
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console.log(uaqCalendar.year(isoDate)); // 1444
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console.log(uaqCalendar.month(isoDate)); // 9 (Ramadan)
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console.log(uaqCalendar.day(isoDate)); // 1
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// Convert Hijri coordinates to ISO
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const ramadan = uaqCalendar.dateFromFields({ year: 1444, month: 9, day: 1 });
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console.log(ramadan.toString()); // "2023-03-23"
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// Date arithmetic in Hijri space
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const { Duration } = Temporal;
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const nextMonth = uaqCalendar.dateAdd(isoDate, new Duration(0, 1));
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console.log(uaqCalendar.month(nextMonth)); // 10 (Shawwal)
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```
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## Calendars
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| Calendar | ID | Authority | Method | Coverage |
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|-------------|--------------|--------------------|--------------------------|------------------|
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| Umm al-Qura | `hijri-uaq` | KACST, Saudi Arabia | Pre-calculated tables | 1318-1500 AH |
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| FCNA/ISNA | `hijri-fcna` | Fiqh Council of NA | Astronomical new moon | Unbounded |
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## Documentation
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Full reference in the [wiki](https://github.com/acamarata/temporal-hijri/wiki).
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- [API Reference](https://github.com/acamarata/temporal-hijri/wiki/API-Reference)
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- [Architecture](https://github.com/acamarata/temporal-hijri/wiki/Architecture)
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- [Examples](https://github.com/acamarata/temporal-hijri/wiki/examples/basic-usage)
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## Conversion behavior
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Conversions between ISO and Hijri dates are pure calendar-date mappings: the same
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ISO date always maps to the same Hijri date on every machine, regardless of the host's
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timezone. `Temporal.PlainDate` carries no time-of-day information, and the underlying
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hijri-core engine operates on UTC calendar days, so there is no timezone dependency.
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Note: the Islamic calendar begins a new day at sunset, not midnight. This library
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follows the civil-calendar convention (midnight boundary) used by most software. Sunset
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day-start determination is out of scope.
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## Related
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- [hijri-core](https://github.com/acamarata/hijri-core): the underlying calendar engine
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- [luxon-hijri](https://github.com/acamarata/luxon-hijri): Hijri support for Luxon
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- [pray-calc](https://github.com/acamarata/pray-calc): Islamic prayer times
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## License
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MIT. Copyright (c) 2026 Aric Camarata. See [LICENSE](LICENSE).
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