The "beaty" of date arithmetic

[Manuel M. Garcia]

The 'time' module is terrible for doing any kind of date arithmetic.
In Python 2.3 there will be a standard module 'datetime' that will
support straightforward and efficient date arithmetic.  But Python 2.3
is in beta right now.

For now, please try 'mxDateTime', an extension module that is
currently the best way to do date arithmetic in Python.

http://www.lemburg.com/files/python/mxDateTime.html

'mxDateTime' is a delight to use compared to the 'time' module.
'mxDateTime' is free to use, and licensed similar to Python.

Manuel