@hebcal/hdate/dist/esm/dateFormat.js

converts between Hebrew and Gregorian dates using Rata Die (R.D.) algorithm by Dershowitz and Reingold

/*! @hebcal/hdate v0.14.4, distributed under GPLv2 https://www.gnu.org/licenses/gpl-2.0.txt */
import { pad4, pad2 } from './pad.js';

const _formatters = new Map();
/**
 * @private
 */
function getFormatter(tzid) {
    const fmt = _formatters.get(tzid);
    if (fmt)
        return fmt;
    const f = new Intl.DateTimeFormat('en-US', {
        year: 'numeric',
        month: '2-digit',
        day: '2-digit',
        hour: '2-digit',
        minute: '2-digit',
        second: '2-digit',
        hour12: false,
        timeZone: tzid,
    });
    _formatters.set(tzid, f);
    return f;
}
const dateFormatRegex = /^(\d+).(\d+).(\d+),?\s+(\d+).(\d+).(\d+)/;
/**
 * Returns a string similar to `Date.toISOString()` but in the
 * timezone `tzid`. Contrary to the typical meaning of `Z` at the end
 * of the string, this is not actually a UTC date.
 */
function getPseudoISO(tzid, date) {
    const str = getFormatter(tzid).format(date);
    const m = dateFormatRegex.exec(str);
    if (m === null) {
        throw new Error(`Unable to parse formatted string: ${str}`);
    }
    let hour = m[4];
    if (hour === '24') {
        hour = '00';
    }
    m[3] = pad4(parseInt(m[3], 10));
    return `${m[3]}-${m[1]}-${m[2]}T${hour}:${m[5]}:${m[6]}Z`;
}
/**
 * Returns number of minutes `tzid` is offset from UTC on date `date`.
 */
function getTimezoneOffset(tzid, date) {
    const utcStr = getPseudoISO('UTC', date);
    const localStr = getPseudoISO(tzid, date);
    const diffMs = new Date(utcStr).getTime() - new Date(localStr).getTime();
    return Math.ceil(diffMs / 1000 / 60);
}
/**
 * Returns YYYY-MM-DD in the local timezone
 */
function isoDateString(dt) {
    return (pad4(dt.getFullYear()) +
        '-' +
        pad2(dt.getMonth() + 1) +
        '-' +
        pad2(dt.getDate()));
}

export { getPseudoISO, getTimezoneOffset, isoDateString };
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