Function decodeTimezoneOffset

query/decoders.ts:386–414

* Decode numerical timezone offset from provided date string. * * Matched these kinds: * - `Z (UTC)` * - `-05` * - `+06:30` * - `+06:30:10` * * Returns offset in miliseconds.

(dateStr: string)

 * Returns offset in miliseconds.
 */
function decodeTimezoneOffset(dateStr: string): null | number {
  // get rid of date part as TIMEZONE_RE would match '-MM` part
  const timeStr = dateStr.split(" ")[1];
  const matches = TIMEZONE_RE.exec(timeStr);

  if (!matches) {
    return null;
  }

  const type = matches[1];

  if (type === "Z") {
    // Zulu timezone === UTC === 0
    return 0;
  }

  // in JS timezone offsets are reversed, ie. timezones
  // that are "positive" (+01:00) are represented as negative
  // offsets and vice-versa
  const sign = type === "-" ? 1 : -1;

  const hours = parseInt(matches[2], 10);
  const minutes = parseInt(matches[3] || "0", 10);
  const seconds = parseInt(matches[4] || "0", 10);

  const offset = hours * 3600 + minutes * 60 + seconds;

  return sign * offset * 1000;
}

export function decodeTid(value: string): TID {
  const [x, y] = value.substring(1, value.length - 1).split(",");