1DIFFTIME(3)                Linux Programmer's Manual               DIFFTIME(3)
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NAME

6       difftime - calculate time difference
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SYNOPSIS

9       #include <time.h>
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11       double difftime(time_t time1, time_t time0);
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DESCRIPTION

14       The  difftime()  function returns the number of seconds elapsed between
15       time time1 and time time0, represented as a double.  Each of the  times
16       is  specified  in calendar time, which means its value is a measurement
17       (in seconds) relative to the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
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ATTRIBUTES

20       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
21       tributes(7).
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23       ┌────────────────────────────────────────────┬───────────────┬─────────┐
24       │Interface                                   │ Attribute     │ Value   │
25       ├────────────────────────────────────────────┼───────────────┼─────────┤
26       │difftime()                                  │ Thread safety │ MT-Safe │
27       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

30       POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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NOTES

33       On a POSIX system, time_t is an arithmetic type, and one could just de‐
34       fine
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36           #define difftime(t1,t0) (double)(t1 - t0)
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38       when the possible overflow in the subtraction is not a concern.
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SEE ALSO

41       date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)
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COLOPHON

44       This page is part of release 5.13 of the Linux  man-pages  project.   A
45       description  of  the project, information about reporting bugs, and the
46       latest    version    of    this    page,    can     be     found     at
47       https://www.kernel.org/doc/man-pages/.
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51GNU                               2021-03-22                       DIFFTIME(3)
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