@progress/kendo-date-math/dist/es2015/tz/offset.js

Kendo UI typescript package exporting functions for Date manipulations

import { zoneAndRule } from './zone-and-rule';
/**
 * @hidden
 *
 * A function that calculates the time offset based on zone name.
 *
 * @param timezone - The timezone name. For example, `America/Chicago`, `Europe/Sofia`.
 * @param date - A date for which the zone rule will be located.
 *
 * @return - Returns the timezone offset in minutes at the specified time.
 */
export const offset = (timezone, date = new Date()) => {
    if (timezone === 'Etc/UTC' || timezone === 'Etc/GMT') {
        return 0;
    }
    if (timezone === '') {
        return date.getTimezoneOffset();
    }
    const { rule, zone } = zoneAndRule(timezone, date);
    return parseFloat(rule ? zone[0] - rule[6] : zone[0]);
};