OutputVar := instance.Negate()
Returns a new MfTimeSpan object whose value is the negated value of this instance.
Returns a new MfTimeSpan object with the same numeric value as this instance, but with the opposite sign.
Throws MfNullReferenceException if called as a static method.
Throws MfOverflowException if the negated value of this instance cannot be represented by a MfTimeSpan; that is, the value of this instance is MinValue.