Question

How to calculate the difference between two time periods in C

Answer 1

#include <stdio.h> 

struct TIME
{
  int seconds;
  int minutes;
  int hours;
};

void TimeDifference(struct TIME t1, struct TIME t2, struct TIME *diff);

int main(void)
{   
    struct TIME startTime, endTime, diff;

    startTime.hours = 13; 
    startTime.minutes = 26;
    startTime.seconds = 17;
    
    endTime.hours = 15; 
    endTime.minutes = 12;
    endTime.seconds = 48;

    TimeDifference(startTime, endTime, &diff);

    printf("%d:%d:%d\n", diff.hours, diff.minutes, diff.seconds);
            
    return 0;
}

void TimeDifference(struct TIME startTM, struct TIME endTM, struct TIME *diff)
{
    if (endTM.seconds > startTM.seconds)
    {
        startTM.minutes--;
        startTM.seconds += 60;
    }

    if(endTM.minutes > startTM.minutes)
    {
        startTM.hours--;
        startTM.minutes += 60;
    }

    diff->seconds = startTM.seconds - endTM.seconds;
    diff->minutes = startTM.minutes - endTM.minutes;
    diff->hours = startTM.hours - endTM.hours;
}

  
/*
run:

-2:13:29

*/

 

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