1difftime(3)                Library Functions Manual                difftime(3)
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NAME

6       difftime - calculate time difference
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

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

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

23       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
24       tributes(7).
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26       ┌────────────────────────────────────────────┬───────────────┬─────────┐
27       │Interface                                   │ Attribute     │ Value   │
28       ├────────────────────────────────────────────┼───────────────┼─────────┤
29       │difftime()                                  │ Thread safety │ MT-Safe │
30       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

33       C11, POSIX.1-2008.
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HISTORY

36       POSIX.1-2001, C89, SVr4, 4.3BSD.
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NOTES

39       On  a  POSIX  system,  time_t is an arithmetic type, and one could just
40       define
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42           #define my_difftime(t1,t0) (double)(t1 - t0)
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44       when the possible overflow in the subtraction is not a concern.
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SEE ALSO

47       date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)
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51Linux man-pages 6.05              2023-07-20                       difftime(3)
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