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For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.
Since December 12 is a doomsday, December 25, being thirteen days afterwards (two weeks less a day), fell on a Saturday. Christmas Day is always the day of the week before doomsday. In addition, July 4 ( U.S. Independence Day ) is always on the same day of the week as a doomsday, as are Halloween (October 31), Pi Day (March 14), and December 26 ...
Leap years have two letters, so for January and February calculate the day of the week for January 1 and for March to December calculate the day of the week for October 1. Leap years are all years that divide exactly by four, with the following exceptions: Gregorian calendar – all years divisible by 100, except those that divide exactly by 400.
National Influenza Vaccination Week (December 6-12) ... December 31. Make Up Your Mind Day. National Champagne Day. New Year's Eve. No Interruptions Day.
The ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of 2020 in the ISO calendar, and is written as 2020-W01-1 or 2020W011.
Dec. 28: National Card Playing Day, National Short Film Day, Pledge of Allegiance Day, National Call-a-Friend Day Dec. 29: International Cello Day, Still Need To Do Day, No Interruptions Day
SSI payments for December went out on Friday, Nov. 29, because Dec. 1 was a Sunday, according to the SSA calendar. January's SSI payments always come out early because Jan. 1 is a holiday.
A leap week calendar is a calendar system with a whole number of weeks in a year, and with every year starting on the same weekday. Most leap week calendars are proposed reforms to the civil calendar, in order to achieve a perennial calendar. Some, however, such as the ISO week date calendar, are simply conveniences for specific purposes. [1]