date-fns/_lib/getTimezoneOffsetInMilliseconds/index.js

Modern JavaScript date utility library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getTimezoneOffsetInMilliseconds;
var MILLISECONDS_IN_MINUTE = 60000;

function getDateMillisecondsPart(date) {
  return date.getTime() % MILLISECONDS_IN_MINUTE;
}
/**
 * Google Chrome as of 67.0.3396.87 introduced timezones with offset that includes seconds.
 * They usually appear for dates that denote time before the timezones were introduced
 * (e.g. for 'Europe/Prague' timezone the offset is GMT+00:57:44 before 1 October 1891
 * and GMT+01:00:00 after that date)
 *
 * Date#getTimezoneOffset returns the offset in minutes and would return 57 for the example above,
 * which would lead to incorrect calculations.
 *
 * This function returns the timezone offset in milliseconds that takes seconds in account.
 */


function getTimezoneOffsetInMilliseconds(dirtyDate) {
  var date = new Date(dirtyDate.getTime());
  var baseTimezoneOffset = Math.ceil(date.getTimezoneOffset());
  date.setSeconds(0, 0);
  var hasNegativeUTCOffset = baseTimezoneOffset > 0;
  var millisecondsPartOfTimezoneOffset = hasNegativeUTCOffset ? (MILLISECONDS_IN_MINUTE + getDateMillisecondsPart(date)) % MILLISECONDS_IN_MINUTE : getDateMillisecondsPart(date);
  return baseTimezoneOffset * MILLISECONDS_IN_MINUTE + millisecondsPartOfTimezoneOffset;
}

module.exports = exports.default;