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Is there any pattern in this (e.g. Once per five years)?
Is it a sliding window?

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It's more complicated than that due to leap years among other things. Check out J.H. Conway's Doomsday rule where all your questions should be answered in full detail. – t.b. Apr 16 '11 at 8:09
@Theo Buehler Thanks. Post as an answer and I will accept. I thought it wouldn't be so simple. – Basarat Ali Apr 16 '11 at 8:20

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up vote 4 down vote accepted

Mostly, in cycles of 6, 11, and 11 years. Leap years only repeat every 28 years. See http://wiki.answers.com/Q/How_often_in_years_do_calendars_repeat_with_the_same_day-date_combinations

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+1 thank you very much. Just what I was looking for – Basarat Ali Apr 17 '11 at 6:05
up vote 6 down vote

It's more complicated than that due to leap years among other things. Check out J.H. Conway's doomsday rule where all your questions should be answered in full detail.

See also the answer and the comments to this related question.

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