C# DateTime to UnixTime and back

DateTimeExtensions

/**
 * DOES NOT take timezones into account, just simple calculations
 */
namespace YourNamespace {
  public static class ExtensionsClassName {
		static readonly DateTime EPOCH = new DateTime (1970, 1, 1, 0, 0, 0);

		public static double UnixTime(this DateTime date)
		{
			return (date - EPOCH).TotalSeconds;
		}

		public static DateTime FromUnixTime(this double utime)
		{
			return EPOCH.AddSeconds (utime);
		}
  }
}