which is the best and simple algorithm for calendar? [closed]

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I am planning to display an android calendar in my application. I want to select a date to use in my application. I need to know whether there is an algorithm for a calendar.

I must not use any open source application.

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Generating an arbitrary Gregorian calendar pretty much amounts to determining the day of the week of the starting day and, for Februaries, determining whether the year is a leap year.

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The best and most famous date algorithm is Conway's Doomsday Rule, http://en.wikipedia.org/wiki/Doomsday_rule