Converts Java SimpleDataFormat to ISO 8601 format

simpleDateToIso.ts

/**
 * Converts Java SimpleDataFormat to ISO 8601 format
 *
 * @example
 * simpleDateIso('2019-01-24T12:42:17:234-0700') => '2019-01-24T12:42:17.234-0700'
 *
 * @param {string} simpleDate - Java SimpleDataFormat string
 * https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
 * @returns {string|null}
 */
export function simpleDateToIso(simpleDate: string): string | null {
  try {
    const dateStamp = simpleDate.split(':');
    if (dateStamp.length !== 4) return null;

    // Time zone is always the last item
    const timeZone = dateStamp.pop();
    // Join together with correct period delimiter
    return `${dateStamp.join(':')}.${timeZone}`;
  } catch (error) {
    return null;
  }
}