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* Initial * CSS lint * Test CI * Add 1v1, 2v2, and 3v3 Tags (#1771) * Initial * CSS lint * Test CI * Rename step --------- Co-authored-by: xi <104683822+ximk@users.noreply.github.com>
32 lines
990 B
TypeScript
32 lines
990 B
TypeScript
// timezone example is 'Asia/Tokyo'
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export function hourDifferenceBetweenTimezones(
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timezone1: string,
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timezone2: string,
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) {
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const offset1 = getTimezoneOffset(timezone1);
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const offset2 = getTimezoneOffset(timezone2);
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return (offset1 - offset2) / 60;
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}
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// https://stackoverflow.com/a/29268535
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function getTimezoneOffset(timeZone: string) {
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const date = new Date();
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// Abuse the Intl API to get a local ISO 8601 string for a given time zone.
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let iso = date
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.toLocaleString("en-CA", { timeZone, hour12: false })
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.replace(", ", "T");
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// Include the milliseconds from the original timestamp
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iso += `.${date.getMilliseconds().toString().padStart(3, "0")}`;
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// Lie to the Date object constructor that it's a UTC time.
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const lie = new Date(`${iso}Z`);
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// Return the difference in timestamps, as minutes
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// Positive values are West of GMT, opposite of ISO 8601
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// this matches the output of `Date.getTimeZoneOffset`
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return -(lie.getTime() - date.getTime()) / 60 / 1000;
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}
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