Convert 12-hour format to 24-hour format in C#

Question

How to convert 12-hour format to 24-hour format in DateTime format.

I already tried to convert the DateTime to string (24-hour format) and convert it back to Datetime format but it is not working.

.Net DateTime struct does not store display format. you need to use `ToString()` with a format provider to display it in whatever format you want. — Zohar Peled, May 22 '16 at 05:38
Please Send your try and also your expected input and output — Rahul Jha, May 22 '16 at 05:45

score 10 · Accepted Answer · answered May 22 '16 at 05:53

10

Using extension methods are also good idea.

public static class MyExtensionClass
{
    public static string ToFormat12h(this DateTime dt)
    {
        return dt.ToString("yyyy/MM/dd, hh:mm:ss tt");
    }

    public static string ToFormat24h(this DateTime dt)
    {
        return dt.ToString("yyyy/MM/dd, HH:mm:ss");
    }
}

Then you can use these 2 methods as following:

var dtNow = DateTime.Now;

var h12Format = dtNow.ToFormat12h();    // "2016/05/22, 10:28:00 PM"
var h24Format = dtNow.ToFormat24h();    // "2016/05/22, 22:28:00"

answered May 22 '16 at 05:53

Siyavash Hamdi

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How to get only hours in 12-hour format in such case? – Thamarai T May 16 '19 at 03:28
@ThamaraiT, just play with the string format ;). You may use `hh:mm:ss`. – Siyavash Hamdi May 16 '19 at 09:05
You mean, to get hours we need to convert the datetime to string, right? – Thamarai T May 16 '19 at 09:58
@ThamaraiT, it's another overload for `ToString`. For `DateTime` format you can use `ToString` method to give the desired format for the date-time. – Siyavash Hamdi May 17 '19 at 20:41

score 9 · Answer 2 · answered May 22 '16 at 05:49

9

DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123); 

dt.ToString("dd/MM/yyyy hh:mm:ss tt"); //12 HOUR FORMAT
dt.ToString("dd/MM/yyyy HH:mm:ss");    //24 HOUR FORMAT

answered May 22 '16 at 05:49

Rahul Jha

1,131
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25

score 1 · Answer 3 · edited Jan 17 '17 at 06:02

1

Check the following code.

string time = Console.ReadLine();
DateTime dt = Convert.ToDateTime(time);
String militaryDate = dt.ToString("HH:mm:sstt");
Console.Write(militaryDate);

edited Jan 17 '17 at 06:02

Ataur Rahman Munna

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answered Jan 17 '17 at 05:29

Sandesh Karade

11
3

Convert 12-hour format to 24-hour format in C#

3 Answers3