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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. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    Microsoft Excel displays the day before January 1, 1900 (the earliest date it can represent) as January 0, 1900. [17] It also treats 1900 incorrectly as a leap year (whereas only centuries divisible by 400 are), so it displays the day before March 1, 1900 as the non-existent February 29 instead of February 28. This means March 1, 1900 is the ...

  4. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...

  5. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    [17] The separator used between date values (year, month, week, and day) is the hyphen, while the colon is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or as "20090106" in the basic format without ambiguity.

  6. Date and time notation in Canada - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    The date can be written either with the day or the month first in Canadian English, optionally with the day of the week. For example, the seventh day of January 2016 can be written as: [5] Thursday, 7 January 2016 or Thursday, January 7, 2016; 7 January 2016; January 7, 2016; 2016-01-07; Formal letters, academic papers, and reports often prefer ...

  7. 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 ...

  8. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    The week number (WW or woy for week of year) of any date can be calculated, given its ordinal date (i.e. day of the year, doy or DDD, 1–365 or 366) and its day of the week (D or dow, 1–7).