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  2. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    There would be 4 months of 5 weeks per normal, 52-week year, or 5 such months in a long, 53-week year. 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:

  3. 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".

  4. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    In some domains, weeks are preferred over months for scheduling and reporting, so they use quarters of exactly 13 weeks each, often following ISO week date conventions. One in five to six years has a 53rd week which is usually appended to the last quarter. It is then 98 days instead of 91 days long, which complicates comparisons.

  5. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    5 days: For traditional markets in Korea, for example, the market is open every five days. Java - (Pasaran) 5 days: Discordian: 5 days: Akan: 6 days: A traditional "six-day week" which combined with the Gregorian seven-day week gave rise to a 42-day cycle. Ancient Rome: 8 days: The Roman nundinal cycle. Burmese: 8 days: Celtic: 8 days ...

  6. Decimal calendar - Wikipedia

    en.wikipedia.org/wiki/Decimal_calendar

    The French Republican Calendar was introduced (along with decimal time) in 1793, and was similar to the ancient Egyptian calendar. [3] It consisted of twelve months, each divided into three décades of ten days, with five or six intercalary days called sansculottides. [3]

  7. List of mammalian gestation durations - Wikipedia

    en.wikipedia.org/wiki/List_of_mammalian...

    The gestation figures given here are shown in days. They represent average values and should only be considered as approximations. Main article: Pregnancy (mammals) § Gestation periods

  8. Month - Wikipedia

    en.wikipedia.org/wiki/Month

    A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words month and Moon are cognates.The traditional concept of months arose with the cycle of Moon phases; such lunar months ("lunations") are synodic months and last approximately 29.53 days, making for roughly 12.37 such months in one Earth year.

  9. 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.