difftime - compute the difference between two calendar time values
double difftime(time_t time1, time_t time0);
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.
The difftime() function shall compute the difference between two calendar times (as returned by time()): time1- time0.
The difftime() function shall return the difference expressed in seconds as a type double.
No errors are defined.
asctime(), clock(), ctime() , gmtime(), localtime(), mktime(), strftime(), strptime(), time(), utime(), the Base Definitions volume of IEEE Std 1003.1-2001, <time.h>
First released in Issue 4. Derived from the ISO C standard.