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  2. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    An ISO week-numbering year (also called ISO year informally) has 52 or 53 full weeks. That is 364 or 371 days instead of the usual 365 or 366 days. These 53-week years occur on all years that have Thursday as 1 January and on leap years that start on Wednesday.

  3. International Science Olympiad - Wikipedia

    en.wikipedia.org/wiki/International_Science_Olympiad

    The International Science Olympiads are a group of worldwide annual competitions in various areas of the formal sciences, natural sciences, and social sciences.The competitions are designed for the 4-6 best high school students from each participating country selected through internal National Science Olympiads, with the exception of the IOL, which allows two teams per country, the IOI, which ...

  4. Leap week calendar - Wikipedia

    en.wikipedia.org/wiki/Leap_week_calendar

    A leap week calendar is a calendar system with a whole number of weeks in a year, and with every year starting on the same weekday. Most leap week calendars are proposed reforms to the civil calendar, in order to achieve a perennial calendar. Some, however, such as the ISO week date calendar, are simply conveniences for specific purposes. [1]

  5. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    The week number can be described by counting the Thursdays: week 12 contains the 12th Thursday of the year. The ISO week-numbering year starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year (hence without overlap or gap). It consists of 52 or 53 full weeks.

  6. Talk:ISO week date - Wikipedia

    en.wikipedia.org/wiki/Talk:ISO_week_date

    So the majority of the days in each week will belong to the ISO week-numbering year with the same number as their Gregorian year. So a week with three days in 2008 and four days in 2009 will belong to the ISO week-numbering year 2009. And a week with four days in 2009 and three days in 2010 will also belong to the ISO week-numbering year 2009.

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  8. Why Trying The Winter Arc Challenge Is Better Than Setting ...

    www.aol.com/lifestyle/why-trying-winter-arc...

    This challenge, which started October 1 and ends January 1, encourages you to become locked in on your goals for the rest of the calendar year, whether that’s training for a half-marathon ...

  9. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Applying the Doomsday algorithm involves three steps: determination of the anchor day for the century, calculation of the anchor day for the year from the one for the century, and selection of the closest date out of those that always fall on the doomsday, e.g., 4/4 and 6/6, and count of the number of days between that date and the date in ...