Question

How to use difftime() to computes the number of seconds passed since the beginning of the month in C

Answer 1

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

    return 0;
}
  
/*
run:
 
2305103 seconds passed since the beginning of the month

*/

 

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