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  2. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...

  3. 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) For an ISO week date Day-of-Week d (1 = Monday to 7 = Sunday), use

  4. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    For March, one can remember either Pi Day or "March 0", the latter referring to the day before March 1, i.e. the last day of February. For the months April through December, the even numbered months are covered by the double dates 4/4, 6/6, 8/8, 10/10, and 12/12, all of which fall on the doomsday.

  5. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    ISO 8601:2004 fixes a reference calendar date to the Gregorian calendar of 20 May 1875 as the date the Convention du Mètre (Metre Convention) was signed in Paris (the explicit reference date was removed in ISO 8601-1:2019). However, ISO calendar dates before the convention are still compatible with the Gregorian calendar all the way back to ...

  6. When is the first day of fall 2019? - AOL

    www.aol.com/lifestyle/first-day-fall-2019...

    This year, the first day of fall will take place on Monday, September 23 for those living in the Northern Hemisphere. To get a little more technical, the fall equinox, which marks the official ...

  7. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    The ISO week date system is ... (last revised in 2019) and, before that ... Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of 2020 in ...

  8. ‘Connections’ Hints and Answers for NYT's Tricky Word ...

    www.aol.com/connections-hints-answers-nyts...

    The New York Times game resets every day at midnight, and some puzzles are more challenging than others. ... Words Before Days of the Week: Ash, Black, Cyber, Fat. 3. Shades of Black: Ebony, Jet ...

  9. GPS week number rollover - Wikipedia

    en.wikipedia.org/wiki/GPS_week_number_rollover

    The second rollover occurred on the night of April 6 to 7, 2019, when GPS Week 2,047, represented as 1,023 in the counter, advanced and rolled over to 0 within the counter. [2] The United States Department of Homeland Security , the International Civil Aviation Organization , and others issued a warning about this event.