How to use a disc calendar?

Turn the small disk so that the year on it is aligned with the month. (Note that the above two years do not mean a certain year to a certain year, but only these two years, such as 20 1 1? 2033 refers to 20 1 1 and 2033, and then look down. If you want to know what day it is today, look at the date corresponding to the small number. In addition, red represents leap year week and red represents Sunday.