public void RemoveHourShouldByEqualsTrue()
{
//Output 04/03/2010 16:02
datetime = DateTime.Parse("04/03/2010 17:00");
string microsoft_result = datetime.AddHours(-2).ToString("dd/MM/yyyy HH:mm");
string new_datetime = my_datetime.SubtractHours("04/03/2010 17:00", 2);
string my_result = my_datetime.Format(new_datetime, 1);
Assert.AreEqual(microsoft_result, my_result);
}