How to subtract a month from Date object?

Question

How do I subtract a month from a date object in VB.NET?

I have tried:

Today.AddMonths(-1)

However, given that Today is 01-Jan-2010, the

Answer 1

This works fine, you need to remember that the DateTime is imutable.

Dim d As DateTime
d = New DateTime(2010, 1, 1)
d = d.AddMonths(-1)

Have a look at DateTime Structure

A calculation on an instance of DateTime, such as Add or Subtract, does not modify the value of the instance. Instead, the calculation returns a new instance of DateTime whose value is the result of the calculation.