Doomsday Trainer

100+
Downloads
Content rating
Everyone
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About this app

This app helps you train the Doomsday Algorithm which allows you to quickly deduce the day of the week to any given date within seconds.

It was invented by John Conway in 1973. Here, a variant is used which was found by Fong and Walters in 2010.

For more information and an in-depth explanation of the algorithm please see the Wikipedia article. But the app contains a condensed explanation and also detailed practice modes for the three major steps in the algorithm.
Updated on
Sep 11, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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What’s new

Minor bug fixes.

App support

About the developer
Bernhard Werner
sum.and.product.software@gmail.com
Germany

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