The difftime() Function in C Program

difftime() is a C library function that calculates the difference, in seconds, between two time values represented by time_t objects. The function takes two arguments: the first is the later time and the second is the earlier time. The result is returned as a double value. For example:

This code would output:

It is defined in the header file, and the syntax is

double difftime(time_t time2, time_t time1);

It is important to note that the first parameter time2 must be the later time and the second parameter time1 must be the earlier time, as the function calculates the difference as time2 - time1.

The difftime() function does not throw any exceptions. It simply calculates the difference between two time_t values and returns the result as a double value. It does not perform any error checking or handle any exceptional cases. It is the responsibility of the developer to ensure that the values passed to the function are valid and meaningful.