Format Timezone Offset

formatTimeZoneOffset.ts

const formatTimeZoneOffset = (offset: number) => {
  return (
    (offset >= 0 ? '+' : '-') +
    ('0' + Math.floor(Math.abs(offset))).slice(-2) +
    ':' +
    ('0' + Math.round((Math.abs(offset) % 1) * 60)).slice(-2)
  );
};