Doomsday Day of the Week Calculator


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Use this device to quickly find the day of the week for any date between 1901 and 2099.  

Doomsday in this context does not refer to world catastrophe, but rather to particular dates in any given year which always fall on the same day. That day is called the “Doomsday” for that given year.

John Conway, UK mathematician, in 1973 developed a technique where a bright person with a little practice can within seconds determine the day of the week for any given date. You can read more about this by doing a search on “Doomsday day of the week “ on internet or Youtube. It’s a fascinating topic.

This device takes those math concepts and converts them to a physical device that anyone can use. The inspiration for this puzzle by Creative Crafthouse came from Jerry Slocum’s puzzle museum where a paper model exists credited to John Foshee.

It is a high quality item 5.8” in diameter made from top grade maple veneer MDF for strength and beauty. The top disk is alder. All lines are precision laser engraved and it turns on a ½” center dowel. It should last a lifetime.

The complete instructions on how to use it are lasered on the back, so you don’t have to worry about losing the instructions.

Made in the USA by Creative Crafthouse.

Object Find the day of the week for any date between 1901 and 2099
Difficulty Level 7 – Challenging
Brand Creative Crafthouse
Types John Foshee, Dave Janelle, More Wood Puzzles
Dimensions 14.7 cm diameter / 5.8 in diameter
Packaging Plastic Bag