C program to calculate difference between two time periods

PROGRAM:

#include <stdio.h>
struct TIME
{
  int seconds;
  int minutes;
  int hours;
};
void differenceBetweenTimePeriod(struct TIME t1, struct TIME t2, struct TIME
     *diff);
 
int main()
{
    struct TIME startTime, stopTime, diff;
 
    printf("Enter start time: \n");
    printf("Enter hours, minutes and seconds respectively: ");
    scanf("%d %d %d", &startTime.hours, &startTime.minutes, 
    &startTime.seconds);
 
    printf("Enter stop time: \n");
    printf("Enter hours, minutes and seconds respectively: ");
    scanf("%d %d %d", &stopTime.hours, &stopTime.minutes, &stopTime.seconds);
 
   
    differenceBetweenTimePeriod(startTime, stopTime, &diff);
 
    printf("\nTIME DIFFERENCE: %d:%d:%d - ", startTime.hours, 
    startTime.minutes, startTime.seconds);
    printf("%d:%d:%d ", stopTime.hours, stopTime.minutes, stopTime.seconds);
    printf("= %d:%d:%d\n", diff.hours, diff.minutes, diff.seconds);
 
    return 0;
}
 
void differenceBetweenTimePeriod(struct TIME start, struct TIME stop, struct 
TIME *diff)
    {
    if(stop.seconds > start.seconds){
    --start.minutes;
    start.seconds += 60;
    }
 
    diff->seconds = start.seconds - stop.seconds;
    if(stop.minutes > start.minutes){
    --start.hours;
    start.minutes += 60;
    }
 
    diff->minutes = start.minutes - stop.minutes;
    diff->hours = start.hours - stop.hours;
}

OUTPUT:

Enter start time:
Enter hours, minutes and seconds respectively: 12
34
55
Enter stop time:
Enter hours, minutes and seconds respectively:8
12
15
 
TIME DIFFERENCE: 12:34:55 - 8:12:15 = 4:22:40






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