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# Convert time from 24 hour clock to 12 hour clock format

• Difficulty Level : Medium
• Last Updated : 02 Aug, 2022

Given a time in a 24-hour clock (military time), convert it to a 12-hour clock format.

Note: Midnight is 00:00:00 on a 24-hour clock and 12:00:00 AM on a 12-hour clock. Noon is 12:00:00 on 24-hour clock and 12:00:00 PM on 12-hour clock.

A string will be given of the format hh:mm: ss and output should be in the format hh:mm: ss AM or hh:mm: ss PM in a 12hour clock. Here hh represents an hour, mm represents minutes and ss represents seconds.

Examples

Input : 17:35:20
Output : 5:35:20 PM
Input : 00:10:24
Output : 12:10:24 AM

The approach to solving this problem requires some observations. First that the minutes and seconds will be the same in both cases. The only change will be in the hours and according to that Meridien will be appended to the string. For hours, first, convert it from string to int datatype, then take its modulo with 12 and that will be our hours in 12-hour format. Still, there will be a case when the hour becomes 00 i.e (12 or 00 in 24-hour format) which we need to handle separately.

Below is the implementation of the above approach:

## C++

 // CPP program to convert time from 24 hour // to 12 hour format   #include   using namespace std;   // Convert Function which takes in // 24hour time and convert it to // 12 hour format void convert12(string str) {     // Get Hours     int h1 = (int)str[0] - '0';     int h2 = (int)str[1] - '0';       int hh = h1 * 10 + h2;       // Finding out the Meridien of time     // ie. AM or PM     string Meridien;     if (hh < 12) {         Meridien = "AM";     }     else         Meridien = "PM";       hh %= 12;       // Handle 00 and 12 case separately     if (hh == 0) {         cout << "12";           // Printing minutes and seconds         for (int i = 2; i < 8; ++i) {             cout << str[i];         }     }     else {         cout << hh;         // Printing minutes and seconds         for (int i = 2; i < 8; ++i) {             cout << str[i];         }     }       // After time is printed     // cout Meridien     cout << " " << Meridien << '\n'; }   // Driver code int main() {     // 24 hour format     string str = "17:35:20";       convert12(str);       return 0; }

## Java

 // Java program to convert time from 24 hour // to 12 hour format   import java.util.*; // Convert Function which takes in // 24hour time and convert it to // 12 hour format class GFG {   static void convert12(String str) { // Get Hours     int h1 = (int)str.charAt(0) - '0';     int h2 = (int)str.charAt(1)- '0';       int hh = h1 * 10 + h2;       // Finding out the Meridien of time     // ie. AM or PM     String Meridien;     if (hh < 12) {         Meridien = "AM";     }     else         Meridien = "PM";       hh %= 12;       // Handle 00 and 12 case separately     if (hh == 0) {         System.out.print("12");           // Printing minutes and seconds         for (int i = 2; i < 8; ++i) {         System.out.print(str.charAt(i));         }     }     else {         System.out.print(hh);         // Printing minutes and seconds         for (int i = 2; i < 8; ++i) {         System.out.print(str.charAt(i));         }     }       // After time is printed     // cout Meridien System.out.println(" "+Meridien); }   //Driver code public static void main(String ar[]) {   // 24 hour format     String str = "17:35:20";     convert12(str);   } }

## Python3

 # Python program to convert time from 24 hour # to 12 hour format   # Convert Function which takes in # 24hour time and convert it to # 12 hour format def convert12(str):       # Get Hours     h1 = ord(str[0]) - ord('0');     h2 = ord(str[1]) - ord('0');       hh = h1 * 10 + h2;       # Finding out the Meridien of time     # ie. AM or PM     Meridien="";     if (hh < 12):         Meridien = "AM";     else:         Meridien = "PM";       hh %= 12;       # Handle 00 and 12 case separately     if (hh == 0):         print("12", end = "");           # Printing minutes and seconds         for i in range(2, 8):             print(str[i], end = "");       else:         print(hh,end="");                   # Printing minutes and seconds         for i in range(2, 8):             print(str[i], end = "");       # After time is printed     # cout Meridien     print(" " + Meridien);   # Driver code if __name__ == '__main__':       # 24 hour format     str = "17:35:20";     convert12(str);   # This code is contributed by 29AjayKumar

## C#

 // C# program to convert time from 24 hour // to 12 hour format    using System; // Convert Function which takes in // 24hour time and convert it to // 12 hour format class GFG {    static void convert12(string str) { // Get Hours     int h1 = (int)str[0] - '0';     int h2 = (int)str[1]- '0';        int hh = h1 * 10 + h2;        // Finding out the Meridien of time     // ie. AM or PM     string Meridien;     if (hh < 12) {         Meridien = "AM";     }     else         Meridien = "PM";        hh %= 12;        // Handle 00 and 12 case separately     if (hh == 0) {         Console.Write("12");            // Printing minutes and seconds         for (int i = 2; i < 8; ++i) {         Console.Write(str[i]);         }     }     else {         Console.Write(hh);         // Printing minutes and seconds         for (int i = 2; i < 8; ++i) {         Console.Write(str[i]);         }     }        // After time is printed     // cout Meridien Console.WriteLine(" "+Meridien); }    //Driver code public static void Main() {    // 24 hour format     string str = "17:35:20";     convert12(str);    } }



## Javascript



Output:

5:35:20 PM

Time Complexity: O(8) = O(1)

Auxiliary Space: O(1)

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