Function getOffsetMinutes

src/time/localized-time.ts:51–54

* Returns the timezone offset, in minutes, for the given instant * (local - UTC). e.g. New York in winter (EST) returns -300.

(date: Date, timezone?: string)

 * (local - UTC). e.g. New York in winter (EST) returns -300.
 */
function getOffsetMinutes(date: Date, timezone?: string): number {
  const offset = parseOffsetMinutes(getTimezoneGMT(date, timezone).replace(/^GMT/, '') || 'Z');
  return offset ?? 0;
}

/**
 * Returns true if the given instant, read back in the timezone, matches the