I have provided two stand-alone computer programs that allow you to compute the Day of the Week using Zeller's Formula.
In the first program, after you enter the date, the day of the week will be printed along with the values of the variables used in Zeller's formula.
This would be useful for teachers who are using the worksheet above, so they can check their students' work.
The second program uses windows to compute the Day of the Week.
Download this program called zeller.exe
Download this program called zeller2.exe
After you have downloaded either of the programs above onto your computer, go to your downloads (under USERS) and RUN the program.
You may save the program to a folder on your hard drive for later use. These programs work on PCs -- I have not tested them on Apple computers.