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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. Knuckle mnemonic - Wikipedia

    en.wikipedia.org/wiki/Knuckle_mnemonic

    One form of the mnemonic is done by counting on the knuckles of one's hand to remember the number of days in each month. [1] Knuckles are counted as 31 days, depressions between knuckles as 30 (or 28/29) days. One starts with the little finger knuckle as January, and one finger or depression at a time is counted towards the index finger knuckle ...

  4. Calends - Wikipedia

    en.wikipedia.org/wiki/Calends

    To calculate the day of the calends of the upcoming month, counting the number of days remaining in the current month is necessary, then adding two to that number. For example, April 22 is the 10th day before the calends of May (ante diem decimum Kalendas Maius), because eight days are left in April and both end dates are included in the total. [1]

  5. 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. [13] 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 ...

  6. List of date formats by country - Wikipedia

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

    d – one-digit day of the month for days below 10, e.g. 2; dd – two-digit day of the month, e.g. 02; ddd – three-letter abbreviation for day of the week, e.g. Fri; dddd – day of the week spelled out in full, e.g. Friday; Separators of the components: / – oblique stroke (slash). – full stop, dot or point (period)-– hyphen (dash ...

  7. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 March 2025" is ten days after "15 March 2025".

  8. Determination of the day of the week - Wikipedia

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

    Thus, the number 7 is treated as 0, the number 8 as 1, the number 9 as 2, the number 18 as 4, and so on. If Sunday is counted as day 1, then 7 days later (i.e. day 8) is also a Sunday, and day 18 is the same as day 4, which is a Wednesday since this falls three days after Sunday (i.e. 18 mod 7 = 4). [a]

  9. Category:Days of April - Wikipedia

    en.wikipedia.org/wiki/Category:Days_of_April

    Pages in category "Days of April" The following 10 pages are in this category, out of 10 total. This list may not reflect recent changes. A. April 1; April 2;