Day of Week Genius is a workout app for your mind that helps you calculate the day of the week for any given date within your head. By memorizing key lists and practicing with flashcard-like repetition, you can master a simple equation to determine the day of the week for any date effortlessly.

The app guides you through learning Day Codes, Month Codes, and Year Codes, along with the Day of Week Equation. You can practice in Tutorial Mode, take the daily Day of Week Challenge, and utilize the "Show Me" feature to see the calculation breakdown for any challenged date.