using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;
public class Test
{
public static void Main()
{
string format = "dd/MM/yyyy hh:mm tt";
DateTime datTime = DateTime.ParseExact("23/11/2012 08:30 pm", format, CultureInfo.InvariantCulture);
string output = datTime.ToString(format, CultureInfo.InvariantCulture);
Console.WriteLine(output);
}
}
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