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.  The two times  are
16       specified in calendar time, which represents the time elapsed since the
17       Epoch (00:00:00 on January 1, 1970, Coordinated Universal Time (UTC)).
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CONFORMING TO

20       SVr4, 4.3BSD, C89, C99
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NOTES

23       On a POSIX system, time_t is an arithmetic type,  and  one  could  just
24       define
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26              #define difftime(t1,t0) (double)(t1 - t0)
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28       when  the  possible  overflow  in the subtraction is not a concern.  On
29       other systems, the data type time_t might use some other encoding where
30       subtraction doesn't work directly.
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CONFORMING TO

33       SVr4, 4.3BSD, POSIX.1-2001.
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SEE ALSO

36       date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)
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40GNU                               2002-02-28                       DIFFTIME(3)