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2. ISO week date - Wikipedia

   en.wikipedia.org/wiki/ISO_week_date

   The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971. It is used (mainly) in government and business for fiscal years ...

3. Perpetual calendar - Wikipedia

   en.wikipedia.org/wiki/Perpetual_calendar

   A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day ...

4. Determination of the day of the week - Wikipedia

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

   For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday.

5. 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". The longer "month" may be set as the first (5–4–4), second (4–5–4), or ...

6. Manage events in AOL Calendar

   help.aol.com/articles/events-in-aol-calendar-manage

   2. Click Calendar. 3. Click on an event in the Day, Week, or Month view. 4. Click Edit. 5. Click the calendar name | select a calendar to move the event to. 6. Click Save. Note: To move a single event, click This Event Only. To move all future occurrences, click This Event and Future.

7. Calendrical calculation - Wikipedia

   en.wikipedia.org/wiki/Calendrical_calculation

   A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details ...