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difftime

Defined in header <time.h> 
double difftime( time_t time_end, time_t time_beg );
-

Computes difference between two calendar times as time_t objects (time_end - time_beg) in seconds. If time_end refers to time point before time_beg then the result is negative.

-

Parameters

- -
time_beg, time_end - times to compare

Return value

Difference between two times in seconds.

-

Notes

On POSIX systems, time_t is measured in seconds, and difftime is equivalent to arithmetic subtraction, but C and C++ allow fractional units for time_t.

-

Example

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The following program computes the number of seconds that have passed since the beginning of the month.

-
#include <stdio.h>
-#include <time.h>
- 
-int main(void)
-{
-    time_t now = time(0);
- 
-    struct tm beg = *localtime(&now);
- 
-    // set beg to the beginning of the month
-    beg.tm_hour = 0,
-    beg.tm_min = 0,
-    beg.tm_sec = 0,
-    beg.tm_mday = 1;
- 
-    double seconds = difftime(now, mktime(&beg));
- 
-    printf("%.f seconds have passed since the beginning of the month.\n", seconds);
- 
-    return 0;
-}

Output:

-
1937968 seconds have passed since the beginning of the month.

References

See also

-
C++ documentation for difftime
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/chrono/difftime -

-
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