private static int digits(int number) {
    int digits = 0;
    do {
      digits++;
      number = number / 10;
    } while (number != 0);
    return digits;
  }
Generates timestamps for different timezone. Here we are testing UTC+14 : Pacific/Kiritimati ,
 UTC-12 : Etc/GMT+12 along with few other zones
ql/src/test/org/apache/hadoop/hive/ql/io/parquet/serde/TestParquetTimestampsHive2Compatibility.java