|DIFFTIME(3)||Library Functions Manual||DIFFTIME(3)|
difftime - calculate time difference
Standard C library (libc, -lc)
double difftime(time_t time1, time_t time0);
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 calendar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
For an explanation of the terms used in this section, see attributes(7).
|difftime ()||Thread safety||MT-Safe|
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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.
|2022-10-09||Linux man-pages 6.01|