Pick any date and put it in, first the month, then the day, and then the year, and it will tell you the day of the week it is. Then, click calculate to calculate the day of the week. This program can do any date from 1900 to 2199. You can use the mute button at the top to mute and un-mute the music. You can use this for things like birthdays, the day you were born, what day a special event will be, or anything else!
The coding is very interesting because there is a formula. If you learn the formula, you can do it mentally too. I learned the formula from a book called The Secrets Of Mental Math, which has many very interesting tricks to doing calculations and other things like these tricks.
