@ipohjs/calendar/dist/helpers/to-utc-date.js

Minimal module to compute a calendar

import { fromPartsToUtcDate } from './from-parts-to-utc-date.js';
export function toUTCDate(inputDate, offset) {
    const offsetYear = offset?.year ?? 0;
    const offsetMonth = offset?.month ?? 0;
    const offsetDate = offset?.day ?? 0;
    const offsetOrder = offset?.order ?? 'ymd';
    let y = inputDate.getUTCFullYear();
    let m = inputDate.getUTCMonth();
    let d = inputDate.getUTCDate();
    const reorderedParts = [...offsetOrder].map((n) => {
        switch (n) {
            case 'y': return [n, [offsetYear, 0, 0]];
            case 'm': return [n, [0, offsetMonth, 0]];
            case 'd':
            default:
                return [n, [0, 0, offsetDate]];
        }
    });
    for (const [key, [dy, dm, dd]] of reorderedParts) {
        const newDate = fromPartsToUtcDate(y + dy, m + dm, d + dd);
        const lastDayOfNewDateCurrentMonth = fromPartsToUtcDate(newDate.getUTCFullYear(), m + dm + 1, 0);
        if (key !== 'd' && d + dd > lastDayOfNewDateCurrentMonth.getUTCDate()) {
            y = lastDayOfNewDateCurrentMonth.getUTCFullYear();
            m = lastDayOfNewDateCurrentMonth.getUTCMonth();
            d = lastDayOfNewDateCurrentMonth.getUTCDate();
        }
        else {
            y = newDate.getUTCFullYear();
            m = newDate.getUTCMonth();
            d = newDate.getUTCDate();
        }
    }
    return fromPartsToUtcDate(y, m, d);
}
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