How to handle 'months' in recurring billing

[pnegahdar]

Currently months are handled using dateutil's relativedelta. A sample output:

day_start = datetime(year=2012,month=1, day=29)
for each in range(20):
... day_start += relativedelta(months=1)
... print day_start
...
2012-02-29 00:00:00
2012-03-29 00:00:00
2012-04-29 00:00:00
2012-05-29 00:00:00
2012-06-29 00:00:00
2012-07-29 00:00:00
2012-08-29 00:00:00
2012-09-29 00:00:00
2012-10-29 00:00:00
2012-11-29 00:00:00
2012-12-29 00:00:00
2013-01-29 00:00:00
2013-02-28 00:00:00
2013-03-28 00:00:00
2013-04-28 00:00:00
2013-05-28 00:00:00
2013-06-28 00:00:00
2013-07-28 00:00:00
2013-08-28 00:00:00
2013-09-28 00:00:00

How good is this 'monthly' strategy for a recurring billing system? Someone pointed out this http://bit.ly/15gLHsZ as an alternative strategy. I think this way makes more sense because you stay within the scope of the current month and it automatically adjusts for leapyears, shorter months, etc.

[fangpenlin]

@pnegahdar
Nice third-party package evaluation and decision you made there. By using dateutil, it saves lots of my time. Thanks.

So far, I think this approach is good enough for most use cases, so I close this issue here.