Subtract time interval from DateTimeOffset, and yields a new date and time in CSharp

//from w  w  w .j  a v  a  2  s.c  om

using System;
public class MainClass{
  public static void Main(String[] argv){  
    DateTimeOffset offsetDate = new DateTimeOffset(2014, 12, 3, 11, 30, 0, 
                                   new TimeSpan(-8, 0, 0)); 
    TimeSpan duration = new TimeSpan(7, 18, 0, 0);
    Console.WriteLine(offsetDate - duration); 

  }
}