28 lines
1014 B
JavaScript
28 lines
1014 B
JavaScript
"use strict";
|
|
exports.getTimezoneOffsetInMilliseconds = getTimezoneOffsetInMilliseconds; /**
|
|
* 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(date) {
|
|
const utcDate = new Date(
|
|
Date.UTC(
|
|
date.getFullYear(),
|
|
date.getMonth(),
|
|
date.getDate(),
|
|
date.getHours(),
|
|
date.getMinutes(),
|
|
date.getSeconds(),
|
|
date.getMilliseconds(),
|
|
),
|
|
);
|
|
utcDate.setUTCFullYear(date.getFullYear());
|
|
return date.getTime() - utcDate.getTime();
|
|
}
|