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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T14:35:47+00:00 2026-05-23T14:35:47+00:00

According to ISO 8601 , time can be specified in different formats. My program

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According to ISO 8601, time can be specified in different formats.

My program does not know which exact ISO 8601 format will be specified.

In this case, how can I convert it to time_t?

strptime requires you to specify format (which I do not know before hand in my case).

Ultimate goal: is to compare 2 time_t timestamps.

Edit 0: Because my goal is to compare 2 time stamps, time_t to ISO 8601 conversion will also work.

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  1. Editorial Team
    Editorial Team
    2026-05-23T14:35:48+00:00Added an answer on May 23, 2026 at 2:35 pm

    If you are on a UNIX like machine, try getdate. The interface is funky but works pretty good.

    Which formats are recognized is
    controlled by the file named by the
    environment variable DATEMSK. This
    file should contain lines of valid
    format strings which could be passed
    to strptime.

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