Doomsday Trainer

Know the day for any date!

Free · Designed for iPad

Learn the day of the week for any date! Train yourself with the Doomsday Algorithm Have you ever wanted to instantly know what day of the week you were born on? Or what day January 1st, 2050 will fall on? With the famous Doomsday Algorithm, you can calculate the exact weekday of any date in history using just mental math—and Doomsday Trainer is the ultimate arcade-style app to teach you how to do it. Download Doomsday Trainer today, master the algorithm, and become a mental time traveler!

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Now with global leaderboards and even more training modes and customization!

Version 1.2

The developer, Maarten Claessen, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    • Seller
      • Maarten Claessen
    • Size
      • 15.5 MB
    • Category
      • Education
    • Compatibility
      Requires iOS 15.0 or later.
      • iPhone
        Requires iOS 15.0 or later.
      • iPad
        Requires iPadOS 15.0 or later.
      • iPod touch
        Requires iOS 15.0 or later.
      • Mac
        Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Languages
      • English
    • Age Rating
      4+
    • Copyright
      • © 2026 Maarten Claessen
  • Privacy Policy

    • Supports

    • Game Center

      Discover new games and play with friends. This game also features leaderboards.