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  2. Week - Wikipedia

    en.wikipedia.org/wiki/Week

    1 week = 1600 ⁄ 6957 ≈ 22.9984% of an average Gregorian month; In a Gregorian mean year, there are 365.2425 days, and thus exactly 52 + 71 ⁄ 400 or 52.1775 weeks (unlike the Julian year of 365.25 days or 52 + 5 ⁄ 28 ≈ 52.1786 weeks, which cannot be represented by a finite decimal expansion). There are exactly 20,871 weeks in 400 ...

  3. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    In every cycle there are 71 years with an additional 53rd week (corresponding to the Gregorian years that contain 53 Thursdays). An average year is exactly 52.1775 weeks long; months (1 ⁄ 12 year) average at exactly 4.348125 weeks/month. An ISO week-numbering year (also called ISO year informally) has 52 or 53 full weeks. That is 364 or 371 ...

  4. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    In conjunction with the system of months, there is a system of weeks. A physical or electronic calendar provides conversion from a given date to the weekday and shows multiple dates for a given weekday and month. Calculating the day of the week is not very simple, because of the irregularities in the Gregorian system. When the Gregorian ...

  5. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1] It has a length of 365 days in an ordinary year but, in order to reconcile the calendar year with the astronomical cycle , it has 366 days in a leap year .

  6. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  7. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Gregorian calendar with four 91-day quarters of 13 weeks International Fixed Calendar: solar: Gregorian: 1902 — A "perpetual calendar" with a year of 13 months of 28 days each. Minguo calendar: solar: Gregorian: 1912: Republic of China: Months and days use the Gregorian calendar, introduced in China in 1912. Revised Julian calendar: solar ...

  8. Leap week calendar - Wikipedia

    en.wikipedia.org/wiki/Leap_week_calendar

    The ISO week date is an example of a leap week calendar that eliminate the month. A leap week calendar can take advantage of the 400-year cycle of the Gregorian calendar, as it has exactly 20,871 weeks: with 329 common years of 52 weeks plus 71 leap years of 53 weeks, a leap week calendar would synchronize with the Gregorian every 400 years ...

  9. Broadcast calendar - Wikipedia

    en.wikipedia.org/wiki/Broadcast_calendar

    Every week in the broadcast calendar starts on a Monday and ends on a Sunday, and every month has either four or five such weeks. Broadcast calendar months thus have either 28 or 35 days. The key link between the broadcast and Gregorian calendars is that the first week of every broadcast month always contains the Gregorian calendar first of the ...