Doomsday Method Tutorial

The Doomsday algorithm is a mental technique for finding the day of the week for any date.

Steps

1. Learn the anchor days for centuries (e.g., 1900s start on a Wednesday).
2. Calculate the year's anchor using the last two digits of the year.
3. Memorize the "doomsday" dates like 4/4, 6/6, 8/8, 10/10 and the last day of Feb.
4. Find the nearest doomsday to your target date and count forward or back to get the weekday.

Practice Tips

• Start with dates in the current year until you can recall the year's anchor quickly.
• Use flash cards for the century anchors and common doomsdays.
• Time yourself with the trainer to build speed and accuracy.

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