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DIFFTIME(3) Linux Programmer's Manual DIFFTIME(3) NAME difftime - calculate time difference SYNOPSIS #include <time.h> double difftime(time_t time1, time_t time0); DESCRIPTION The difftime() function returns the number of seconds elapsed between time time1 and time time0, represented as a double. Each of the times is specified in calβ endar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01 00:00:00 +0000 (UTC). ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βdifftime() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD. NOTES On a POSIX system, time_t is an arithmetic type, and one could just define #define difftime(t1,t0) (double)(t1 - t0) when the possible overflow in the subtraction is not a concern. SEE ALSO date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3) GNU 2021-03-22 DIFFTIME(3)