Github user adrian-wang commented on the pull request:

    https://github.com/apache/spark/pull/7589#issuecomment-125090078
  
    @yjshen I have checked with hive 1.2
    hive> select months_between('2014-10-01 00:00:00', '2014-09-16 12:00:00');
    0.5
    
    but if we just use `(time1 - time2) / (31.0 * MILLIS_PER_DAY * 1000L)`
    we will get 0.4677419354838....


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