Open in App
Not now

# Difference between two given times

• Difficulty Level : Medium
• Last Updated : 25 Sep, 2022

Given two times in string “HH:MM” format. Here ‘H’ shows hours and ‘M’ shows minutes. You have to find the difference in the same string format between these two strings. But both given strings should follow these cases.
1) Time 1 will be less than or equal to time2
2) Hours will be possible from 0 to 23.
3) Minutes will be possible from 0 to 59

Examples:

Input : s1 = "14:00";
s2 = "16:45";
Output : result = "2:45"

Input : s1 = "1:04"
s2 = "13:05"
Output : result = "12:01"

The idea is to first remove colon. After removing colon, hour difference can be computed using simple mathematics.

## C++

 // C++ program to find difference between two // given times. #include using namespace std;   // remove ':' and convert it into an integer int removeColon(string s) {     if (s.size() == 4)         s.replace(1, 1, "");           if (s.size() == 5)         s.replace(2, 1, "");           return stoi(s); }   // Main function which finds difference string diff(string s1, string s2) {       // change string (eg. 2:21 --> 221, 00:23 --> 23)     int time1 = removeColon(s1);     int time2 = removeColon(s2);        // difference between hours     int hourDiff = time2 / 100 - time1 / 100 - 1;       // difference between minutes     int minDiff = time2 % 100 + (60 - time1 % 100);       if (minDiff >= 60) {         hourDiff++;         minDiff = minDiff - 60;     }       // convert answer again in string with ':'        string res = to_string(hourDiff) + ':' + to_string(minDiff);     return res; }   // Driver program to test above functions int main() {     string s1 = "14:00";     string s2 = "16:45";     cout << diff(s1, s2) << endl;     return 0; }

## Java

 /*package whatever //do not write package name here */ import java.io.*;   class GFG {         // Java program to find difference between two // given times.   // remove ':' and convert it into an integer static int removeColon(String s) {     if (s.length() == 4)         s = s.substring(0,1) + s.substring(2);           if (s.length() == 5)         s = s.substring(0,2) + s.substring(3);           return Integer.valueOf(s); }   // Main function which finds difference static String diff(String s1, String s2) {       // change string (eg. 2:21 --> 221, 00:23 --> 23)     int time1 = removeColon(s1);     int time2 = removeColon(s2);       // difference between hours     int hourDiff = time2 / 100 - time1 / 100 - 1;       // difference between minutes     int minDiff = time2 % 100 + (60 - time1 % 100);       if (minDiff >= 60) {         hourDiff++;         minDiff = minDiff - 60;     }       // convert answer again in string with ':'       String res = String.valueOf(hourDiff) + ':' + String.valueOf(minDiff);     return res; }     // Driver Code public static void main(String args[]) {     String s1 = "14:00";     String s2 = "16:45";     System.out.println(diff(s1, s2)); } }   // This code is contributed by shinjanpatra

## Python3

 # Python 3 program to find difference between two # given times.   # Remove ':' and convert it into an integer def removeColon(s):           if (len(s) == 4):         s = s[:1] + s[2:]           if (len(s) == 5):         s = s[:2] + s[3:]           return int(s)   # Main function which finds difference def diff(s1, s2):           # Change string     # (eg. 2:21 --> 221, 00:23 --> 23)     time1 = removeColon(s1)     time2 = removeColon(s2)       # Difference between hours     hourDiff = time2 // 100 - time1 // 100 - 1;       # Difference between minutes     minDiff = time2 % 100 + (60 - time1 % 100)       if (minDiff >= 60):         hourDiff += 1         minDiff = minDiff - 60       # Convert answer again in string with ':'     res = str(hourDiff) + ':' + str(minDiff)           return res   # Driver code s1 = "14:00" s2 = "16:45"   print(diff(s1, s2))   # This code is contributed by ApurvaRaj

## C#

 // C# program to find difference between two // given times.   using System;   class GFG {       // remove ':' and convert it into an integer     static int removeColon(string s)     {         if (s.Length == 4)             s = s.Substring(0, 1) + s.Substring(2);           if (s.Length == 5)             s = s.Substring(0, 2) + s.Substring(3);           return Convert.ToInt32(s);     }       // Main function which finds difference     static string diff(string s1, string s2)     {           // change string (eg. 2:21 --> 221, 00:23 --> 23)         int time1 = removeColon(s1);         int time2 = removeColon(s2);           // difference between hours         int hourDiff = time2 / 100 - time1 / 100 - 1;           // difference between minutes         int minDiff = time2 % 100 + (60 - time1 % 100);           if (minDiff >= 60) {             hourDiff++;             minDiff = minDiff - 60;         }           // convert answer again in string with ':'           string res = Convert.ToString(hourDiff) + ":"                      + Convert.ToString(minDiff);         return res;     }       // Driver Code     public static void Main(string[] args)     {         string s1 = "14:00";         string s2 = "16:45";         Console.WriteLine(diff(s1, s2));     } }   // This code is contributed by phasing17

## Javascript



Output:

2:45

Time complexity: O(1), as the length of the string will be either 4 or 5, the operations performed by stoi and replace will be considered to be constant.
Auxiliary space: O(1)

This article is contributed by Harshit Agrawal. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

My Personal Notes arrow_drop_up
Related Articles