Doomsday Trainer
Know the day for any date!
About
Master the Doomsday Algorithm to instantly calculate the day of the week for any historical date. Engage in timed challenges, compete against others, and practice various calculation methods to improve your speed and accuracy.
What's New in Doomsday Trainer
1.3.6
April 20, 2026
Various bug fixes and game mode improvements!
Developer apps
FAQ
What is the Doomsday Algorithm?
The Doomsday Algorithm is a method for calculating the day of the week for any given date. Doomsday Trainer allows you to master this algorithm through various practice modes and challenges.
How does Doomsday Trainer help with learning?
Doomsday Trainer offers a built-in tutorial, targeted drills for specific components like months and centuries, and multiple training methods to cater to different learning styles.
Can I compete with other users on Doomsday Trainer?
Yes, Doomsday Trainer features a live 1-on-1 battle mode where you can challenge opponents. It also includes global leaderboards for longest streak and fastest average speed.
What are the different training methods available in Doomsday Trainer?
Doomsday Trainer supports six methods: the classic Doomsday, Odd + 11, The Wollin Shortcut, Conway's Method, Mod 28, and a Custom Mode for personalized practice.
Is Doomsday Trainer suitable for all ages?
Doomsday Trainer has an age rating of 4+, making it accessible for a wide range of users interested in learning and practicing date calculations.
How often is Doomsday Trainer updated?
The latest version of Doomsday Trainer is 1.3.6, and it was last updated on April 20, 2026. Updates typically bring improvements and new features.
Does Doomsday Trainer have ads?
No, Doomsday Trainer is ad-free, allowing for an uninterrupted learning and practice experience.
What devices does Doomsday Trainer support?
Doomsday Trainer is available on iPhone, iPad, and iPod devices.