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Showing content from https://en.cppreference.com/w/cpp/algorithm/../algorithm/../../cpp/../c/chrono/difftime.html below:

difftime - cppreference.com

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.

Difference between two times in seconds.

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.

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.

• C17 standard (ISO/IEC 9899:2018):

• 7.27.2.2 The difftime function (p: 285)

• C11 standard (ISO/IEC 9899:2011):

• 7.27.2.2 The difftime function (p: 390)

• C99 standard (ISO/IEC 9899:1999):

• 7.23.2.2 The difftime function (p: 338)

• C89/C90 standard (ISO/IEC 9899:1990):

• 7.12.2.2 The difftime function (p: 171)

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