luxon-hijri/dist/toHijri.js

A Hijri date converter based on the Umm al-Qura calendar system, using Luxon for date manipulations.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.toHijri = void 0;
// toHijri.ts
const luxon_1 = require("luxon");
const hDates_1 = require("./hDates");
function toHijri(gregorianDate) {
    if (!(gregorianDate instanceof Date) || isNaN(gregorianDate.getTime())) {
        throw new Error('Invalid Gregorian date');
    }
    const inputDate = luxon_1.DateTime.fromJSDate(gregorianDate).startOf('day');
    const closestDate = hDates_1.hDatesTable.reduce((prev, curr) => {
        const currDate = luxon_1.DateTime.local(curr.gy, curr.gm, curr.gd).startOf('day');
        if (currDate <= inputDate && currDate > luxon_1.DateTime.fromJSDate(prev)) {
            return currDate.toJSDate();
        }
        return prev;
    }, new Date(0));
    const correspondingHijriYear = hDates_1.hDatesTable.find((date) => {
        const dt = luxon_1.DateTime.local(date.gy, date.gm, date.gd).startOf('day');
        return dt.toJSDate().getTime() === closestDate.getTime();
    });
    if (correspondingHijriYear) {
        const differenceInDays = inputDate.diff(luxon_1.DateTime.fromJSDate(closestDate).startOf('day'), 'days').days;
        let hijriYear = correspondingHijriYear.hy;
        let hijriMonth = 0;
        let remainingDays = Math.round(differenceInDays);
        for (let i = 0; i < 12; i++) {
            const daysInThisMonth = (correspondingHijriYear.dpm >> i) & 1 ? 30 : 29;
            if (remainingDays < daysInThisMonth) {
                hijriMonth = i + 1;
                break;
            }
            remainingDays -= daysInThisMonth;
        }
        return { hy: hijriYear, hm: hijriMonth, hd: remainingDays + 1 };
    }
    return null;
}
exports.toHijri = toHijri;