using System;
using System.Text;
class Sample
{
public static void Main()
{
DateTimeOffset dt = new DateTimeOffset(2000, 2, 3, 10, 20, 30,new TimeSpan());
TimeSpan ts = TimeSpan.FromMinutes(90);
Console.WriteLine(dt.Add(ts));
Console.WriteLine(dt - ts);
}
}
The output:
2/3/2000 11:50:30 AM +00:00
2/3/2000 8:50:30 AM +00:00