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Doomsday for 2018 is Wedesday
January 3, 2018
Today, the 3rd day of January, is a Wednesday this year.
This is a special day, as it allows for some interesting Calendar math.
Today being Wednesday means that:
... are also all Wednesdays this year.
So if 2018-12-12 is Wednesday, then two weeks later is Wednesday, so Christmas this year falls on Tuesday.
If 2018-10-10 is Wednesday, then two days 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!