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  2. Ordinal date - Wikipedia

    en.wikipedia.org/wiki/Ordinal_date

    Mission control center's board with time data, displaying coordinated universal time with ordinal date (without year) prepended, on October 22, 2013 (i.e.2013-295). An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also ...

  3. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The first year of the current Julian period, or that of which the number in each of the three subordinate cycles is 1, was the year 4713 BC, and the noon of January 1 of that year, for the meridian of Alexandria, is the chronological epoch, to which all historical eras are most readily and intelligibly referred, by computing the number of ...

  4. January 1 - Wikipedia

    en.wikipedia.org/wiki/January_1

    January 1 is the first day of the year in the Gregorian Calendar; 364 days remain until the end of the year (365 in leap years). This day is also known as New Year's Day since the day marks the beginning of the year.

  5. List of days of the year - Wikipedia

    en.wikipedia.org/wiki/List_of_days_of_the_year

    On This Day; BBC: On This Day; The New York Times: On This Day; Library of Congress: Today in History; History Channel (US): This Day in History; History Channel (UK): This Day in History; New Zealand Government: Today in New Zealand History Archived 2017-04-14 at the Wayback Machine; Computer History Museum: This Day in History

  6. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    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.

  7. New Year's Day - Wikipedia

    en.wikipedia.org/wiki/New_Year's_Day

    This is an accepted version of this page This is the latest accepted revision, reviewed on 4 February 2025. First day of the year in the Gregorian calendar; 1 January This article is about the first day of the Gregorian calendar year. For the first day in other calendars, see New Year. For other uses, see New Year's Day (disambiguation). New Year's Day Fireworks in Mexico City for the ...

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  9. 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 ...