code: public static long getTimeMillis(int year, int month, int dayOfMonth,
              String zoneId) {
          return getTimeMillis(year, month, dayOfMonth, 0, 0, 0, zoneId);
      }
docs: Gets time millis.
  
  @param year       the year
  @param month      the month
  @param dayOfMonth the day of month
  @param zoneId     the zone id
  @return the time millis