@Deprecated
  public java.sql.Timestamp add(java.sql.Timestamp ts, HiveIntervalYearMonth interval) {
    if (ts == null || interval == null) {
      return null;
    }

    java.sql.Timestamp tsResult = new java.sql.Timestamp(0);
    add(ts, interval, tsResult);

    return tsResult;
  }
Perform month arithmetic to millis value using UTC time zone.
@param millis
@param months
@return
ql/src/java/org/apache/hadoop/hive/ql/util/DateTimeMath.java