GNU Info

(libc.info)Parsing Date and Time

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Convert textual time and date information back
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   The ISO C standard does not specify any functions which can convert
the output of the `strftime' function back into a binary format.  This
led to a variety of more-or-less successful implementations with
different interfaces over the years.  Then the Unix standard was
extended by the addition of two functions: `strptime' and `getdate'.
Both have strange interfaces but at least they are widely available.

Low-Level Time String Parsing

Interpret string according to given format.

General Time String Parsing

User-friendly function to parse data and

time strings.