Marc Mintel
5397309103
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41 lines
1.5 KiB
Plaintext
41 lines
1.5 KiB
Plaintext
const offsetFormatCache = {};
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const offsetCache = {};
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/**
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* The function extracts UTC offset in minutes from the given date in specified
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* time zone.
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*
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* Unlike `Date.prototype.getTimezoneOffset`, this function returns the value
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* mirrored to the sign of the offset in the time zone. For Asia/Singapore
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* (UTC+8), `tzOffset` returns 480, while `getTimezoneOffset` returns -480.
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*
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* @param timeZone - Time zone name (IANA or UTC offset)
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* @param date - Date to check the offset for
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*
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* @returns UTC offset in minutes
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*/
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export function tzOffset(timeZone, date) {
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try {
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const format = offsetFormatCache[timeZone] ||= new Intl.DateTimeFormat("en-GB", {
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timeZone,
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hour: "numeric",
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timeZoneName: "longOffset"
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}).format;
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const offsetStr = format(date).split('GMT')[1] || '';
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if (offsetStr in offsetCache) return offsetCache[offsetStr];
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return calcOffset(offsetStr, offsetStr.split(":"));
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} catch {
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// Fallback to manual parsing if the runtime doesn't support ±HH:MM/±HHMM/±HH
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// See: https://github.com/nodejs/node/issues/53419
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if (timeZone in offsetCache) return offsetCache[timeZone];
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const captures = timeZone?.match(offsetRe);
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if (captures) return calcOffset(timeZone, captures.slice(1));
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return NaN;
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}
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}
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const offsetRe = /([+-]\d\d):?(\d\d)?/;
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function calcOffset(cacheStr, values) {
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const hours = +values[0];
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const minutes = +(values[1] || 0);
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return offsetCache[cacheStr] = hours > 0 ? hours * 60 + minutes : hours * 60 - minutes;
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} |