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 POSIX.1-2017 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
First released in Issue 4. Derived from the ISO C standard.
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