You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
26 lines
1.2 KiB
26 lines
1.2 KiB
3 years ago
|
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
export default 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;
|
||
|
|
}
|