How To Calculate Day Of Week For Any Date

How To Calculate The Day Of The Week For Any Date

This method uses codes for different months and years to speed up the calculation of the day of the week. You might even be able to memorize the codes. We'll use December 16, 2482 as an example.

• Take the last 2 digits of the year. In our example, this is 82.

• Divide by 4, and drop any remainder. 82 / 4 = 20, remainder 2, so we think "20."

• Add the day of the month. In our example, 20 + 16 = 36.

• Add the month's key value, from the following table.

• The month for our example is December, with a key value of 6. 36 + 6 = 42.

• If your date is in January or February of a leap year, subtract 1. We're using December, so we don't have to worry about this step.

• Add the century code from the following table.

• Our example year is 2482, our code is 6.

• Add the last two digits of the year. 48 + 82 = 130.

• Divide by 7 and take the remainder. This time, 1 means Sunday, 2 means Monday, and so on. A remainder of 0 means Saturday. 130 / 7 = 18, remainder 4, so December 16, 2482 will be on the fourth day of the week-- Wednesday.