code: public static DateTimeZone forOffsetMillis(int millisOffset) {
          if (millisOffset < -MAX_MILLIS || millisOffset > MAX_MILLIS) {
              throw new IllegalArgumentException("Millis out of range: " + millisOffset);
          }
          String id = printOffset(millisOffset);
          return fixedOffsetZone(id, millisOffset);
      }
docs: Gets a time zone instance for the specified offset to UTC in milliseconds.
  
  @param millisOffset  the offset in millis from UTC, from -23:59:59.999 to +23:59:59.999
  @return the DateTimeZone object for the offset