WeekdayWidget

Want to learn the ‘Human Calendar’ trick and quickly calculate the day of the week for any calendar date in your head?

WeekdayWidget is the definitive platform for learning, training, and performing mental weekday calculation. It has never been easier to learn this skill- in addition to the comprehensive text and video tutorials, WeekdayWidget features an exclusive ‘Guided Solve’ mode that walks you step by step through the full process until you’re ready to solve on your own!

The app also features:

- Sleek user interface with unlockable themes

- Training minigames for practicing individual steps in the full process

- Speedrun mode based on official Memoriad categories

- Text-to-speech functionality to emulate spoken performances

- Fully customizable date range from 1600 - 2100

…and more!

Whether you’re learning for a mathematics demonstration, training for Mental Olympics competition, or just picking up a neat party trick, WeekdayWidget’s flexibility makes it the ideal platform no matter the use case. ‘Doomsday’ algorithm inventor John Conway was famously able to calculate any weekday in under two seconds… Can you beat that?