public void RemoveMinutesShouldByEqualsTrue()
{
//Output 04/03/2010 16:12
datetime = DateTime.Parse("04/03/2010 17:00");
string microsoft_result = datetime.AddMinutes(-48).ToString("dd/MM/yyyy HH:mm");
string new_datetime = my_datetime.SubtractMinutes("04/03/2010 17:00", 48);
string my_result = my_datetime.Format(new_datetime, 1);
Assert.AreEqual(microsoft_result, my_result);
}