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

[Roy Smith]

In article <mailman.1924.1237149940.11746.python-list at python.org>,
 Chris Rebert <clp2 at rebertia.com> wrote:

> Not that that date could even be represented by most programs since
> it's before 1970. Talk about recentism! :-)
> I've always wondered how historians using computers deal with that 
> limitation...

The unix time format it well known for being extremely limited both in 
terms of extent and precision.  Julian Date 
(http://en.wikipedia.org/wiki/Julian_date) is a commonly used time scale 
for working with events far into the past or future.