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Asked: 2026-06-10T22:30:26+00:00

I want the query to calculate the difference between two date time fields to

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I want the query to calculate the difference between two date time fields

  • to calculate total time taken

  • two date time fields are in same table
    as start_time and stop_time

  • And I want to calculate total start duration and stop duration
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1 Answer

  1. Editorial Team

    You can use MySQL’s UNIX_TIMESTAMP() function to convert your datetime expressions to seconds since the UNIX epoch, then taking the sum of all differences will yield the total duration in seconds:

    SELECT SUM(UNIX_TIMESTAMP(stop_time) - UNIX_TIMESTAMP(start_time)) FROM my_table

    See it on sqlfiddle.

    Note that UNIX_TIMESTAMP() is limited to the range '1970-01-01 00:00:01' UTC to '2038-01-19 03:14:07' UTC.

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