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Sounds good Steve. I hope more people join in on the project.

Yes, the day of the week is easy. Now need we need to keep track of the day of the year, day of the current month, the current month of the year, the year and if it is a leap year or not. I have heard that most perpetual calendar mechanism have 31 days in a month and then subtract from this the appropriate number of days for each month.

The MB&F is based upon a 28 month days and add the appropriate number of days. This approach is what I trying to reproduce. Search you tube for MB&F perpetual calendar and some animation videos on how this system works should appear. I watched the videos many time and have a gist of how the system works, but to put it down in a functioning design will not be easy. Attached is an imagine of the mechanism.