difftime
From cppreference.com
| Defined in header
<time.h>
|
||
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.
Contents |
[edit] Parameters
| time_beg, time_end | - | times to compare |
[edit] Return value
Difference between two times in seconds.
[edit] 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.
[edit] Example
The following program computes the number of seconds that have passed since the beginning of the month.
Run this code
#include <stdio.h> #include <time.h> int main(void) { time_t now; time(&now); struct tm beg; 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.
[edit] See also
|
C++ documentation for difftime
|