Note: It is very unlikely that a problem will ever come up where you know everything about a date but the Century. However, it is possible for it to come up, and so just in case it does, and also to show how how the formula also works for this calculation too, here it is.
How to Calculate the Century when you have the Month, Day, and last two digits of the Year.
How to Calculate the Century when you have the Month, Day, and last two digits of the Year.
Calculate Steps 1 through 3 of the Day-of-Week technique, using 0 (zero) in Step 2 for the Century, then calculate Step 4, below, using the resulting (result) value from those steps.
Step 4 – Look up the known Day of the Week for the Target Date in the Day-of-WeekTable. If the Result is greater than the value for the target Day-of-Week, add 7 to that target Day-of-Week value. Now subtract the Result from the adjusted Day-of-Week value. This result is the value for the target Century you are looking for. Look up the Century in the Century Table. (You should only have a 0, 5, 3 or 1.)
