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  2. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Starting in March, the sequence basically alternates 3, 2, 3, 2, 3, but every five months there are two 31-day months in a row (July–August and December–January). [1] The fraction 13/5 = 2.6 and the floor function have that effect; the denominator of 5 sets a period of 5 months. The overall function, , normalizes the result to reside in the ...

  3. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.

  4. Module:Calendar date - Wikipedia

    en.wikipedia.org/wiki/Module:Calendar_date

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  5. Determination of the day of the week - Wikipedia

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

    For example, September and December correspond, because 1 September falls on the same day as 1 December (as there are precisely thirteen 7-day weeks between the two dates). Months can only correspond if the number of days between their first days is divisible by 7, or in other words, if their first days are a whole number of weeks apart.

  6. Template:Date - Wikipedia

    en.wikipedia.org/wiki/Template:Date

    The PHP library, that this template ultimately depends on, converts out-of-range values to the next-best in-range values. As a result, some date-like values that are not actually valid dates get converted anyway. These include... all dates with zero day-of-the-month. Such a "zero-th" day of a month gets converted into the last day of the ...

  7. Template:Format date - Wikipedia

    en.wikipedia.org/wiki/Template:Format_date

    The year to render in the date. Example 1997 Auto value: Number: suggested: Month: 2 month: The month to render in the date. Example January Auto value: String: suggested: Day: 3 day: The day of the month to format in the date. Example 20 Auto value: String: suggested: Hour (HH) 4 hour hh: the hour to format in the date (if desired) Example 03 ...

  8. Template:Date table sorting - Wikipedia

    en.wikipedia.org/wiki/Template:Date_table_sorting

    Default date sorting does not work for spelled-out month–year or year–month combos and dates before the year 100, but it works in most other circumstances. For more information, see Help:Sortable tables § Date sorting problems .

  9. 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 ...