Quick Start

This guide covers the most common use cases in date-fns-hijri. All examples use the default Umm al-Qura (UAQ) calendar. For FCNA/ISNA calendar output, pass { calendar: 'fcna' } as the last argument to any function.

Installation

pnpm add date-fns-hijri hijri-core

hijri-core is a required peer dependency. It provides the calendar engine and must be installed alongside this package.

Convert a Gregorian date to Hijri

import { toHijriDate } from 'date-fns-hijri';

const date = new Date(2023, 2, 23); // March 23, 2023
const hijri = toHijriDate(date);
// { hy: 1444, hm: 9, hd: 1 }

toHijriDate returns null for dates outside the UAQ table range (1318-1500 AH, approximately 1900-2076 CE). Always check for null before using the result.

Convert a Hijri date to Gregorian

import { fromHijriDate } from 'date-fns-hijri';

const gregorian = fromHijriDate(1444, 9, 1);
// Date: 2023-03-23T00:00:00.000Z

Format a Hijri date

import { formatHijriDate } from 'date-fns-hijri';

const date = new Date(2023, 2, 23);
const label = formatHijriDate(date, 'iDD iMMMM iYYYY');
// '01 Ramadan 1444'

Supported format tokens:

Token	Output
`iYYYY`	Hijri year (4 digits)
`iYY`	Hijri year (2 digits)
`iMM`	Month number (01-12)
`iMMM`	Short month name
`iMMMM`	Full month name
`iDD`	Day (01-30)
`iD`	Day (1-30)

Get a month name

import { getHijriMonthName } from 'date-fns-hijri';

const name = getHijriMonthName(9);
// 'Ramadan'

const shortName = getHijriMonthName(9, { format: 'short' });
// 'Ram'

Add months in Hijri space

import { addHijriMonths } from 'date-fns-hijri';

const ramadan = new Date(2023, 2, 23); // 1 Ramadan 1444
const shawwal = addHijriMonths(ramadan, 1);
// Date representing 1 Shawwal 1444 (April 21, 2023)

Month arithmetic respects variable-length Hijri months (29 or 30 days depending on the calendar).

Use the FCNA calendar

import { toHijriDate, formatHijriDate } from 'date-fns-hijri';

const opts = { calendar: 'fcna' };
const hijri = toHijriDate(new Date(2023, 2, 23), opts);
const label = formatHijriDate(new Date(2023, 2, 23), 'iDD iMMMM iYYYY', opts);

FCNA (Fiqh Council of North America) uses astronomical new moon calculation rather than the Umm al-Qura table. Results may differ by one day around month boundaries.

CommonJS

const { toHijriDate, fromHijriDate, formatHijriDate } = require('date-fns-hijri');

const hijri = toHijriDate(new Date(2023, 2, 23));

Next steps

API Reference for the full function list and signatures
Architecture for how the calendar engine and format layer work
Advanced Guide for error handling, range validation, and locale patterns

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