December 31

Originally published on December 31, 2004.
Last updated on June 5, 2016.

Every
Year
December 31 is the 365th day of the year (366th in leap years) in the Gregorian calendar.
Every
Year
When epochs refer to January 0, it is an alternate name for December 31 of the previous year.

January 0 is used to keep the epoch in the same year instead of referring to a previous year.

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