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An interesting read on how to calculate the day of week for any date in the Gregorian calendar. You only have to know if it’s a leap year, and one special day, February 28 of 1900 (which happened to be on Wednesday.)

rudy.ca/doomsday.html

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The Polonkai family

This instance is dedicated to the members of the Polonkai family. If your surname is Polonkai, you are more than welcome here.