using System;
using System.Globalization;
 
public class Test
{
        public static void Main()
        {
                Console.WriteLine(UnixTimeToDateTime("1340517600"));    
        }
 
        private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, 
                                                              DateTimeKind.Utc);
        
        public static DateTime UnixTimeToDateTime(string text)
        {
            double seconds = double.Parse(text, CultureInfo.InvariantCulture);
            return Epoch.AddSeconds(seconds);
        }
}