## Algorithm

Problem Name: Algorithms - Time Conversion

In this HackerRank Functions in Algorithms - Java programming problem solution,

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

Note: – 12:00:00AM on a 12-hour clock is 00:00:00 on a 24-hour clock.

– 12:00:00PM on a 12-hour clock is 12:00:00 on a 24-hour clock.

Example

• s = ‘12:01:00PM’

Return ’12:01:00′.

• s = ‘12:01:00PM’

Return ’00:01:00′.

Function Description

Complete the timeConversion function in the editor below. It should return a new string representing the input time in 24 hour format.

timeConversion has the following parameter(s):

• string s: a time in 12 hour format

Returns

• string: the time in 24 hour format

Input Format

A single string s that represents a time in 12-hour clock format (i.e.:hh:mm:ssAM  or hh:mm:ssPM).

Constraints

• All input times are valid

Sample Input 0

`07:05:45PM`

Sample Output 0

`19:05:45`

## Code Examples

### #1 Code Example with C Programming

```Code - C Programming```

``````
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {

/* Enter your code here. Read input from STDIN. Print output to STDOUT */
char timestamp[11] = "\0\0\0\0\0\0\0\0\0\0\0";
int hr = 0;

scanf("%s", timestamp);

if(timestamp[8] == 'P'){
hr = 10 * (timestamp[0] - '0') + (timestamp[1] - '0');
if(hr < 12) hr += 12;
}
else{
hr = 10 * (timestamp[0] - '0') + (timestamp[1] - '0');
if(hr == 12) hr = 0;
}

timestamp[0] = hr / 10 + '0';
timestamp[1] = hr % 10 + '0';
timestamp[8] = '\0';
timestamp[9] = '\0';

printf("%s", timestamp>;
return 0;
}
``````
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### #2 Code Example with C++ Programming

```Code - C++ Programming```

``````
#include <cmath>
#include <cstdio>
#include <vector>
#include <string>
#include <iostream>
#include <algorithm>
using namespace std;
string print(int h){
if(h < 10) return "0" + to_string(h);
}

int main() {
/* Enter your code here. Read input from STDIN. Print output to STDOUT */
int h , m , s;
string str;
char r;
cin >> h >> r >> m >> r >> s >> str;
if(str == "PM" &&  h != 12) h = h + 12;
else if(str == "AM" && h == 12) h = (h + 12)% 24;
cout << print(h) << ":" << print(m) << ":" << print(s> << endl;
return 0;
}
``````
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### #3 Code Example with Java Programming

```Code - Java Programming```

``````
import java.io.*;
import java.math.*;
import java.text.*;
import java.util.*;
import java.util.regex.*;

public class Solution {

/*
* Complete the timeConversion function below.
*/
static String timeConversion(String s) {
if(s.charAt(8) == 'P'){

String portion = s.substring(0,8);
String[] times = portion.split(":");
if(times[0].matches("12")){
return times[0] + ":" + times[1] + ":" + times[2];
}
times[0] = String.valueOf(Integer.valueOf(times[0]) + 12);
return times[0] + ":" + times[1] + ":" + times[2];
}else{
String portion = s.substring(0,8);
String[] times = portion.split(":");
if(times[0].matches("12")){
times[0]= "00";
return times[0] + ":" + times[1] + ":" + times[2];
}
return s.substring(0,8);
}
}

private static final Scanner scan = new Scanner(System.in);

public static void main(String[] args) throws IOException {
BufferedWriter bw = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

String s = scan.nextLine();

String result = timeConversion(s);

bw.write(result);
bw.newLine();

bw.close();
}
}
``````
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### #4 Code Example with PHP Programming

```Code - PHP Programming```

``````
``````
``` Copy The Code & ```
``` #5 Code Example with C# Programming Code - C# Programming using System; using static System.Console; class Solution { static void Main(String[] args) { var time = ReadLine(); var amOrPm = time.Substring(8); var hourComponent = time.Substring(0, 2); var remainingTimeComponent = time.Substring(2, 6); if (amOrPm == "AM" && hourComponent == "12") { hourComponent = "00"; } else if (amOrPm == "PM") { var numericHourComponent = int.Parse(hourComponent); if (numericHourComponent != 12) { hourComponent = Convert.ToString(12 + numericHourComponent); } } WriteLine(hourComponent + remainingTimeComponent); } } Copy The Code & #6 Code Example with Python Programming Code - Python Programming import os import sys def timeConversion(s): time = s.split(":") if s[-2:] == "PM": if time[0] != "12": time[0] = str(int(time[0])+12) else: if time[0] == "12": time[0] = "00" ntime = ':'.join(time) return str(ntime[:-2]) if __name__ == '__main__': f = open(os.environ['OUTPUT_PATH'], 'w') s = input() result = timeConversion(s) f.write(result + '\n') f.close() Copy The Code & Advertisements (adsbygoogle = window.adsbygoogle || []).push({}); Demonstration ```
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