There are two calendars--one for normal years with 365 days, and one for leap years with 366 days. Leap years are divisible by 4. Centuries, like 1900, are not leap years unless they are divisible by 400. So, 2000 was a leap year. To find the day of year number for a standard date, scan down the Jan column to find the day of month, then scan across to the appropriate month column and read the day of year number.When is the next US holiday?
The next federal holiday is Memorial Day . Memorial Day is 48 days away and will be observed on Monday, May 31, 2021. † When a holiday falls on Saturday or Sunday, most employees observed the holiday on the previous Friday or following Monday, respectively ( 5 U.S.C. 6103 (b) and Executive Order 11582 3 (a) ).