Convert AM/PM time to 24 hours format in C#?

Question

I am trying to solve the Time Conversion problem of HackerRank in C#. Basically, you are given a string in AM/PM format and you need to convert it to military time (24 hours time format).

The sample input is: 07:05:45PM Expected output is: 19:05:45

I have tried "DateTime.Parse(timeString)", the solution proposed in this thread, but it gives me wrong answer (I get 07:05:45 as output, it only removes the AM/PM):

DateTime dt = DateTime.Parse("01:00 PM");
dt.ToString("HH:mm");

I searched a little more in DateTime library and also tried DateTime.TryParseExact(), but I get the same result:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Globalization;

class Solution {
    
    static string timeConversion(string inputTimeString) 
    {    
        DateTime outputTime;
        
        bool res = DateTime.TryParseExact(
            inputTimeString, 
            "hh:mm:sstt", 
            System.Globalization.CultureInfo.InvariantCulture,
            DateTimeStyles.None, 
            out outputTime);
        
        //Console.WriteLine("res: " + res);
        
        return outputTime.ToString("hh:mm:ss");
    }

    static void Main(string[] args) 
    {
        TextWriter tw = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

        string s = Console.ReadLine();

        string result = timeConversion(s);

        tw.WriteLine(result);

        tw.Flush();
        tw.Close();
    }
}

Your code is `outputTime.ToString("hh:mm:ss")`, not `outputTime.ToString("HH:mm")` (as you stated above). — ProgrammingLlama, Jan 05 '21 at 08:52

score 0 · Accepted Answer · answered Jan 05 '21 at 09:02

0

From the specs:

"hh"    The hour, using a 12-hour clock from 01 to 12.

"HH"    The hour, using a 24-hour clock from 00 to 23.

So use HH.

answered Jan 05 '21 at 09:02

Palle Due

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That was the problem. Thank you very much. – Dênis Silva Oliveira Jan 05 '21 at 09:40

Convert AM/PM time to 24 hours format in C#?

1 Answers1