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From Kentaro Suzuki:
This app shows you learn an amazing way to compute the day of the week at the touch of a finger. It features examples and diagrams on how this computational method works.Screenshots explained Swipe up and down to read through the instructions displayed. An example date appears at the top of the screen. You can change it if desired. Tap the refresh button at the top of the screen to bring up the settings menu.Settings Date: Set which date to use as an example. Choose the year, month, and day*. Hand: Select whether you will use your left or right hand.* The accepted date range is all dates beginning October 15, 1582 on the Gregorian calendar. Years should be inputted as the last four digits.