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  2. Determination of the day of the week - Wikipedia

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

    One standard approach is to look up (or calculate, using a known rule) the value of the first day of the week of a given century, look up (or calculate, using a method of congruence) an adjustment for the month, calculate the number of leap years since the start of the century, and then add these together along with the number of years since ...

  3. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    Although the days of a month (except February) always belong to 5 and sometimes 6 different weeks, there would never be 6 weeks belonging to a single month. The 5-week months would meet one of the following three criteria: The first day of the month is a ... Thursday and the month has 29 through 31 days. Wednesday and the month has 30 or 31 days.

  4. 4–4–5 calendar - Wikipedia

    en.wikipedia.org/wiki/4–4–5_calendar

    The 4–4–5 calendar is a method of managing accounting periods, and is a common calendar structure for some industries such as retail and manufacturing.It divides a year into four quarters of 13 weeks, each grouped into two 4-week "months" and one 5-week "month".

  5. Template:Age in years, months, weeks and days - Wikipedia

    en.wikipedia.org/wiki/Template:Age_in_years...

    {{Age in years, months, weeks and days |month = 1 |day = 1 |year = 1 }} → 2023 years, 11 months, 2 weeks and 6 days; Alternatively, the first set of parameters can be left out to get the time left until a future date, such as the next Wikipedia Day: {{Age in years, months, weeks and days |month2 = 1 |day2 = 15 |year2 = 2025 }} → 3 weeks and ...

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  7. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    100 days, roughly equivalent to 1/4 of a year (91.25 days). In Chinese tradition "bǎi rì" is the hundredth day after one's birth, also called Baby's 100 Days Celebration. semester: 18 weeks: A division of the academic year. [6] Literally "six months", also used in this sense. lunar year: 354.37 d: year: 12 mo: 365 or 366 d: common year: 365 d

  8. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    One can find the day of the week of a given calendar date by using a nearby doomsday as a reference point. To help with this, the following is a list of easy-to-remember dates for each month that always land on the doomsday. The last day of February is always a doomsday.

  9. Ordinal date - Wikipedia

    en.wikipedia.org/wiki/Ordinal_date

    The most trivial method of calculating the ordinal day involves counting up all days that have elapsed per the definition: Let O be 0. From i = 1 .. m - 1, add the length of month i to O, taking care of leap year according to the calendar used. Add d to O. Similarly trivial is the use of a lookup table, such as the one referenced. [3]

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