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Home/ Questions/Q 9246205
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Editorial Team
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Editorial Team
Asked: June 18, 20262026-06-18T09:26:28+00:00 2026-06-18T09:26:28+00:00

If I use the C++ time difference (timediff) function to caculate a the difference

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If I use the C++ time difference (timediff) function to caculate a the difference between 2 times and the later time is after the time change for day light savings will the returned difference caculate this.

E.g. I have a time of 23:00 and a time of 11:00. The time changes in the middle of this time i.e it goes forward one hour.

Will I get 12 hours or 11 difference?

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  1. Editorial Team
    Editorial Team
    2026-06-18T09:26:30+00:00Added an answer on June 18, 2026 at 9:26 am

    The function is difftime, not timediff. And it takes two
    time_t as arguments; time_t typically represent UTC, not
    a particular local time, so the summer time issue doesn’t occur.

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