Friday the 13th… again?

March 13th, 2009

The superstitious might have noticed that we’ve had a Friday 13th last month too. Coincidence? Not at all! It so happens to be that February and March always have the same distribution of weekdays. (Except for leap years) This is so because February has 28 days - exactly 4 weeks. So if February the 1st is a Sunday, like this year, March the 1st will be too. The same goes for the other days up to the 28th. Again, this does not apply to leap years - February 1st, 2008 was a Friday, but because of the added day, March 1st 2008 was a Saturday.

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