code: public static String changeFormatAndTimeZoneToDefaultUtcFormat(
              String dateFormat, String dateString) {
          return getTimeAsDefaultUtcFormat(changeTimestampToLong(dateFormat,
                  dateString));
      }
docs: Change format and time zone to default utc format string.
  
  @param dateFormat the date format
  @param dateString the date string
  @return the string