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

public class Test
{
    
	public static void Main()
	{
            string DateString = "Fri, 14 Dec 2012 6:52 am PST";
            DateTime dt;
            bool parsable = DateTime.TryParseExact(
                DateString.Replace("PST", "+2")
                , "ddd, dd MMM yyyy h:mm tt z"
                , CultureInfo.InvariantCulture
                , DateTimeStyles.None
                , out dt);
            Console.WriteLine("{0} {1}",dt.ToLongDateString(),dt.ToLongTimeString());
	}
}