title: Adding months to existing date
body: <p>If I have an existing date column, how can I add a certain number of months to that date?</p>
  
  <p>Example, something like this</p>
  
  <pre><code>UPDATE TrackingData
  SET DATEADD(mm, 18, ExpiryDate)    -- ExpiryDate is the date column I want to add the months to
  WHERE EmployeeID = @EmployeeID
  </code></pre>
  
  <p>Kind regards</p>