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Showing content from http://www.cplusplus.com/difftime below:

function

<ctime>

difftime 
double difftime (time_t end, time_t beginning);

Return difference between two times

Calculates the difference in seconds between beginning and end.

Parameters
end
Higher bound of the time interval whose length is calculated.
beginning
Lower bound of the time interval whose length is calculated.
If this describes a time point later than end, the result is negative.
time_t is an alias of a fundamental arithmetic type capable of representing times as returned by function time.

Return Value The result of (end-beginning) in seconds as a floating-point value of type double.

Example 
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/* difftime example */
#include <stdio.h>      /* printf */
#include <time.h>       /* time_t, struct tm, difftime, time, mktime */

int main ()
{
  time_t now;
  struct tm newyear;
  double seconds;

  time(&now);  /* get current time; same as: now = time(NULL)  */

  newyear = *localtime(&now);

  newyear.tm_hour = 0; newyear.tm_min = 0; newyear.tm_sec = 0;
  newyear.tm_mon = 0;  newyear.tm_mday = 1;

  seconds = difftime(now,mktime(&newyear));

  printf ("%.f seconds since new year in the current timezone.\n", seconds);

  return 0;
}

Output: 
3777291 seconds since new year in the current timezone.


Data races Concurrently calling this function is safe, causing no data races.

Exceptions (C++)No-throw guarantee: this function never throws exceptions.

See also
asctime
Convert tm structure to string (function)
gmtime
Convert time_t to tm as UTC time (function)
localtime
Convert time_t to tm as local time (function)
time
Get current time (function)

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