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      Description

      TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2) Returns datetime_expr2 − datetime_expr1, where datetime_expr1 and datetime_expr2 are date or datetime expressions. One expression may be a date and the other a datetime; a date value is treated as a datetime having the time part '00:00:00' where necessary. The unit for the result (an integer) is given by the unit argument. The legal values for unit are the same as those listed in the description of the TIMESTAMPADD() function.

      • Syntax
        TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2)
        -unit
        Is the part of datetime_expr1 and datetime_expr2 that specifies the type of boundary crossed.
        -datetime_expr1
        Is an expression that can be resolved to a time, date.
        -datetime_expr2
        Same with startdate.
      • Example
        SELECT TIMESTAMPDIFF(year, '2015-12-31 23:59:59.9999999', '2017-01-01 00:00:00.0000000') from tab; --> 2

      CALCITE:

       SELECT timestampdiff(YEAR, timestamp '2019-06-01 07:01:11', timestamp '2020-06-01 07:01:11'),timestampdiff(QUARTER, timestamp '2019-06-01 07:01:11', timestamp '2020-06-01 07:01:11'),timestampdiff(MONTH, timestamp '2019-06-01 07:01:11',timestamp '2020-06-01 07:01:11'),timestampdiff(WEEK, timestamp '2019-06-01 07:01:11',timestamp '2020-06-01 07:01:11'),timestampdiff(DAY, timestamp '2019-06-01 07:01:11',timestamp '2020-06-01 07:01:11'),timestampdiff(HOUR, timestamp '2019-06-01 07:01:11',timestamp '2020-06-01 07:01:11'),timestampdiff(MINUTE, timestamp '2019-06-01 07:01:11',timestamp '2020-06-01 07:01:11'),timestampdiff(SECOND, timestamp '2019-06-01 07:01:11',timestamp '2020-06-01 07:01:11') FROM depts;
      | 1     | 4     | 12     | **52**     | 366    | 8784    | 527040     | 31622400  
      

      MSSQL:

      SELECT
        datediff(YEAR, '2019-06-01 07:01:11','2020-06-01 07:01:11'),
        datediff(QUARTER, '2019-06-01 07:01:11', '2020-06-01 07:01:11'),
        datediff(MONTH, '2019-06-01 07:01:11','2020-06-01 07:01:11'),
        datediff(WEEK, '2019-06-01 07:01:11', '2020-06-01 07:01:11'),
        datediff(DAY, '2019-06-01 07:01:11','2020-06-01 07:01:11'),
        datediff(HOUR, '2019-06-01 07:01:11','2020-06-01 07:01:11'),
        datediff(MINUTE, '2019-06-01 07:01:11','2020-06-01 07:01:11'),
        datediff(SECOND,  '2019-06-01 07:01:11', '2020-06-01 07:01:11')
      FROM stu;
      |1	|4	|12	|**53**	|366	|8784	|527040	|31622400
      

      The differences I have discussed with the calcite community. And find the reason: https://stackoverflow.com/questions/26138167/is-timestampdiff-in-mysql-equivalent-to-datediff-in-sql-server.
      So, In this JIRA. we will keep consistency with calcite.

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              • Assignee:
                sunjincheng121 sunjincheng
                Reporter:
                sunjincheng121 sunjincheng
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                • Created:
                  Updated:
                  Resolved: