How to add months to a date (datetime object)?

[Roy Smith]

In article <49bd4252$0$512$bed64819 at news.gradwell.net>, tinnews at isbd.co.uk 
wrote:
 
> > Well, before you can "add three months" to something, you need to explain 
> > what that means.
> [...]
> No, it's perfectly possible applying simple logic.

I didn't say it was not possible.  I just said that a precursor to doing it 
is understand what you mean by "add three months".  There is no universal 
definition for what that means.