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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 calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    In other words, the Julian calendar gains 3.1 days every 400 years. Gregory's calendar reform modified the Julian rule, to reduce the average length of the calendar year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year: the Gregorian calendar gains just 0.1 day over 400 years. For any given ...

  4. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Note: In this algorithm January and February are counted as months 13 and 14 of the previous year. E.g. if it is 2 February 2010 (02/02/2010 in DD/MM/YYYY), the algorithm counts the date as the second day of the fourteenth month of 2009 (02/14/2009 in DD/MM/YYYY format) So the adjusted year above is:

  5. 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 ...

  6. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Within each 100-year block, the cyclic nature of the Gregorian calendar proceeds in the same fashion as its Julian predecessor: A common year begins and ends on the same day of the week, so the following year will begin on the next successive day of the week. A leap year has one more day, so the year following a leap year begins on the second ...

  7. 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

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  9. Common year starting on Monday - Wikipedia

    en.wikipedia.org/wiki/Common_year_starting_on_Monday

    A common year starting on Monday is any non-leap year (i.e., a year with 365 days) that begins on Monday, 1 January, and ends on Monday, 31 December. Its dominical letter hence is G . The most recent year of such kind was 2018 , and the next one will be 2029 in the Gregorian calendar , or likewise, 2019 and 2030 in the Julian calendar , see ...