Apple’s Unofficial Fiscal Calendar for 2009 – 2010

If you’re an iPhone developer with apps in the app store you want to know when fiscal months start and end so you can estimate your monthly profit. The problem is that Apple hasn’t published an updated fiscal calendar for 2009 – 2010. So, we took it upon ourselves to fill in the blanks and figure it out.

We’ve updated the “profit by region” report to sport these new dates so you don’t have to worry about them. If you’re still curious here’s what we found.

The calendar’s pattern is simple and follows several basic rules:

1. Every month starts on a Sunday and ends on a Saturday
2. Q1 starts at the end of September
3. Every quarter starts with a 5-week month followed by two 4-week months

Putting it all together, here’s a calendar for the remainder of 2009 and all of 2010:

Keep in mind: This is not an official calendar from Apple. Actual calendar might be different as Apple never ceases to surprise.