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// unit is mstype DriftTolerance = [number, number];
function verifyTime(  utcNotBefore: string | undefined,  utcNotOnOrAfter: string | undefined,  drift: DriftTolerance = [0, 0]): boolean {
  const now = new Date();
  if (!utcNotBefore && !utcNotOnOrAfter) {    // show warning because user intends to have time check but the document doesn't include corresponding information    console.warn('You intend to have time validation however the document doesn\'t include the valid range.');    return true;   }
  let notBeforeLocal: Date | null = null;  let notOnOrAfterLocal: Date | null = null;
  const [notBeforeDrift, notOnOrAfterDrift] = drift;
  if (utcNotBefore && !utcNotOnOrAfter) {    notBeforeLocal = new Date(utcNotBefore);    return +notBeforeLocal + notBeforeDrift <= +now;  }  if (!utcNotBefore && utcNotOnOrAfter) {    notOnOrAfterLocal = new Date(utcNotOnOrAfter);    return +now < +notOnOrAfterLocal + notOnOrAfterDrift;  }
  notBeforeLocal = new Date(utcNotBefore!);  notOnOrAfterLocal = new Date(utcNotOnOrAfter!);
  return (    +notBeforeLocal + notBeforeDrift <= +now &&    +now < +notOnOrAfterLocal + notOnOrAfterDrift  );
}
export {  verifyTime};