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See http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_date-add See http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_date-sub See http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_datediff
HIVE-345 Extend Date UDFs to support time zone and full specs as in MySQL