calculate difference between two prime period

calculate difference between two prime period

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+// Computes time difference of two time period
+// Time periods are entered by the user
+
+#include <iostream>
+using namespace std;
+
+struct TIME
+{
+  int seconds;
+  int minutes;
+  int hours;
+};
+
+void computeTimeDifference(struct TIME, struct TIME, struct TIME *);
+
+int main()
+{
+    struct TIME t1, t2, difference;
+
+    cout << "Enter start time." << endl;
+    cout << "Enter hours, minutes and seconds respectively: ";
+    cin >> t1.hours >> t1.minutes >> t1.seconds;
+
+    cout << "Enter stop time." << endl;
+    cout << "Enter hours, minutes and seconds respectively: ";
+    cin >> t2.hours >> t2.minutes >> t2.seconds;
+
+    computeTimeDifference(t1, t2, &difference);
+
+    cout << endl << "TIME DIFFERENCE: " << t1.hours << ":" << t1.minutes << ":" << t1.seconds;
+    cout << " - " << t2.hours << ":" << t2.minutes << ":" << t2.seconds;
+    cout << " = " << difference.hours << ":" << difference.minutes << ":" << difference.seconds;
+    return 0;
+}
+void computeTimeDifference(struct TIME t1, struct TIME t2, struct TIME *difference){
+
+    if(t2.seconds > t1.seconds)
+    {
+        --t1.minutes;
+        t1.seconds += 60;
+    }
+
+    difference->seconds = t1.seconds - t2.seconds;
+    if(t2.minutes > t1.minutes)
+    {
+        --t1.hours;
+        t1.minutes += 60;
+    }
+    difference->minutes = t1.minutes-t2.minutes;
+    difference->hours = t1.hours-t2.hours;
+}