16 lines
879 B
JavaScript
16 lines
879 B
JavaScript
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/**
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* Google Chrome as of 67.0.3396.87 introduced timezones with offset that includes seconds.
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* They usually appear for dates that denote time before the timezones were introduced
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* (e.g. for 'Europe/Prague' timezone the offset is GMT+00:57:44 before 1 October 1891
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* and GMT+01:00:00 after that date)
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*
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* Date#getTimezoneOffset returns the offset in minutes and would return 57 for the example above,
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* which would lead to incorrect calculations.
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*
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* This function returns the timezone offset in milliseconds that takes seconds in account.
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*/
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export default function getTimezoneOffsetInMilliseconds(date) {
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var utcDate = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds()));
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utcDate.setUTCFullYear(date.getFullYear());
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return date.getTime() - utcDate.getTime();
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}
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