difftime

Standard C library (libc, -lc)

The difftime() function returns the number of seconds elapsed between time time1 and time time0, represented as a double. Each time is a count of seconds.

difftime(b, a) acts like (b-a) except that the result does not overflow and is rounded to double.

For an explanation of the terms used in this section, see attributes(7).

C11, POSIX.1-2008.

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