difftime(3) Library Functions Manual difftime(3) difftime - (libc -lc) #include double difftime(time_t time1, time_t time0); difftime() time1 time0 double. . difftime(b, a) (b-a) double. attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |difftime() | | MT-Safe | +------------+------------------------------------+--------------------+ C11, POSIX.1-2008. POSIX.1-2001 C89 SVr4 4.3BSD. date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3) 3 . . : . 6.18 8 2026 difftime(3)