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  2. December 31 - Wikipedia

    en.wikipedia.org/wiki/December_31

    December 31 is the 365th day of the year (366th in leap years) in the Gregorian calendar. It is known by a collection of names including: Saint Sylvester's Day, [1] New Year's Eve or Old Year's Day/Night, as the following day is New Year's Day. It is the last day of the year; the following day is January 1, the first day of the following year.

  3. New Year's Eve - Wikipedia

    en.wikipedia.org/wiki/New_Year's_Eve

    In the Gregorian calendar, New Year's Eve refers to the evening, or commonly the entire day, of the last day of the year, 31 December, also known as Old Year's Day. In many countries, New Year's Eve is celebrated with dancing, eating, drinking, and watching or lighting fireworks. Many Christians attend a watchnight service to mark the occasion.

  4. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1] It has a length of 365 days in an ordinary year but, in order to reconcile the calendar year with the astronomical cycle, it has 366 days in a leap year. With 97 leap years every 400 years, the Gregorian calendar ...

  5. Mark Your Calendar With These Festive December Holidays (It's ...

    www.aol.com/lifestyle/mark-calendar-festive...

    Dec. 31: New Year's Eve, National Champagne Day, Universal Hour of Peace (from 11:30 pm to 12:30 am on Jan. 1), Make Up Your Mind Day December Weekly Holidays and Observances National Cookie ...

  6. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    January 0 or 0 January is an alternative name for December 31.January 0 is the day before January 1 in an annual ephemeris.It keeps the date in the year for which the ephemeris was published, thus avoiding any reference to the previous year, even though it is the same day as December 31 of the previous year.

  7. Saint Sylvester's Day - Wikipedia

    en.wikipedia.org/wiki/Saint_Sylvester's_Day

    Among the Western churches, the feast day is held on the anniversary of Saint Sylvester's death, 31 December, a date that, since the adoption of the Gregorian calendar, has coincided with New Year's Eve. For these Christian denominations, Saint Sylvester's Day liturgically marks the seventh day of Christmastide. [2]

  8. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

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