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Doomsday for 2017 is Tuesday
February 28, 2017
Today, the last day of February, is a Tuesday this year.
This is a special day, as it allows for some interesting Calendar math.
Today being Tuesday means that
... are also all Tuesdays this year.
So if 2017-12-12 is Tuesday, then two weeks later is Tuesday, so Christmas this year falls on Monday.
If 2017-10-10 is Tuesday, then the day before has to be Canadian Thanksgiving, the second Monday of October.
The Doomsday Algorithm (created by John Horton Conway, who came up with the name "Doomsday") includes complete details for calculating the day of the week for any date -- in your head!