How to show date time with am/pm using C# in ASP.NET?

You can use string.Format and tt to get AM/PM in C# time, take a look the below example

string.Format("{0:hh:mm:ss tt}", DateTime.Now)

This should give you the string value of the time. tt should append the am/pm.

DateTime.Now gives you current date/time of the day in C#.

In C# DateTime value you use the following :

• if you use "hh" -> The hour, using a 12-hour clock from 01 to 12.
• if you use "HH" -> The hour, using a 24-hour clock from 00 to 23.
• if you use "mm" -> The minute, from 00 through 59.
• if you use "m" - > The minute, from 0 through 59.
• if you add "tt" -> The Am/Pm designator.

To learn more about formats https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings read it.

Above answer works, But I would like to explain few more points.

When you will create datetime variable as below, you can get am/pm values.

		DateTime datevariable = new DateTime(1, 1, 1, 22, 10, 0);
        var TimeInPM = datevariable.ToString("hh:mm tt");   // this show  10:10 PM
        var twentyFourHoursTime=datevariable.ToString("HH:mm");     // this shows 22:10
		Console.WriteLine(TimeInPM);
		Console.WriteLine(twentyFourHoursTime);

OR

If you just want to get the AM/PM part of the date, you can use below code

datevariable.ToString("tt");

Console.WriteLine(datevariable.ToString("tt")); // prints "PM" using above example

OR

If you have date in a date string like "02/22/2021 04:11", then you can parse it and show am/pm with it

var date= DateTime.ParseExact(
					"02/22/2021 04:11 AM",
					"M/dd/yyyy hh:mm tt", 
					System.Globalization.CultureInfo.InvariantCulture
				);
		Console.WriteLine(date);

Try this one to get all date and time with AM/PM in C#

DateTime dateTime = new DateTime(2022, 1, 1, 22, 10, 0);
		var str = dateTime.ToString("dd/MM/yyyy hh:mm:ss tt", System.Globalization.CultureInfo.InvariantCulture);
		Console.WriteLine(str);

// prints 01/01/2022 10:10:00 PM

Thanks