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2. Doomsday rule - Wikipedia

   en.wikipedia.org/wiki/Doomsday_rule

   The doomsday's anchor day calculation is effectively calculating the number of days between any given date in the base year and the same date in the current year, then taking the remainder modulo 7. When both dates come after the leap day (if any), the difference is just 365y + ⁠ y / 4 ⁠ (rounded down). But 365 equals 52 × 7 + 1, so after ...

3. Determination of the day of the week - Wikipedia

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

   The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.

4. 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 ...

5. Zeller's congruence - Wikipedia

   en.wikipedia.org/wiki/Zeller's_congruence

   These formulas are based on the observation that the day of the week progresses in a predictable manner based upon each subpart of that date. Each term within the formula is used to calculate the offset needed to obtain the correct day of the week. For the Gregorian calendar, the various parts of this formula can therefore be understood as follows:

6. 360-day calendar - Wikipedia

   en.wikipedia.org/wiki/360-day_calendar

   The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

7. Numbers (spreadsheet) - Wikipedia

   en.wikipedia.org/wiki/Numbers_(spreadsheet)

   For instance, the formula in D4 would read =C4/B4. Excel automates this later task by using a relative referencing system that works as long as the cells retain their location relative to the formula. However, this system requires Excel to track any changes to the layout of the sheet and adjust the formulas, a process that is far from foolproof ...

8. The best laundry detergent sheets of 2025 - AOL

   www.aol.com/lifestyle/best-laundry-detergent...

   We appreciate the fact that you can bulk-order between 50, 200, or 400 sheets — so between a month or a year’s worth of laundry with a 20% discount to boot.

9. Dominical letter - Wikipedia

   en.wikipedia.org/wiki/Dominical_letter

   The 23rd is ante diem vii kalendas Martias, the next day in a leap year is a.d. bis sextum kal. Mart., the next day is the regular a.d.vi kal. Mart., and so to the end of the month. For example, in 2024 (=GF), all days preceding the leap day corresponded to a common-year G calendar, and all days afterward corresponded to a common-year F calendar.