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  2. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    Weeks start with Monday and end on Sunday. Each week's year is the Gregorian year in which the Thursday falls. The first week of the year, hence, always contains 4 January. ISO week year numbering therefore usually deviates by 1 from the Gregorian for some days close to 1 January.

  3. 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 ...

  4. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  5. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    the week starting with the Monday in the period 29 December to 4 January. As a consequence, if 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01. If 1 January is on a Friday, Saturday or Sunday, it is in week 52 or 53 of the previous year (there is no week 00). 28 December is always in the last week of its year.

  6. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    year, month, and day – most systems, including the Gregorian calendar (and its very similar predecessor, the Julian calendar), the Islamic calendar, the Solar Hijri calendar and the Hebrew calendar; year, week, and weekday – e.g., the ISO week date; Cycles can be synchronized with periodic phenomena: Sun and Moon, Schedel's Nuremberg ...

  7. Here’s the full list of holidays and observances to celebrate ...

    www.aol.com/news/full-list-holidays-observances...

    January 8 to 14: National Mocktail Week, National Pizza Week, Home Office and Security Week. January 15 to 21: National Healthy Weight Week. January 15 to 23: International Snowmobile Safety Week ...

  8. What’s the point of a Leap Year? Why 2024 brings 29 days of ...

    www.aol.com/point-leap-why-2024-brings-192452163...

    Every so often, the shortest month of the year, February, is given one extra day, making it 29 days long. 2024 is one of those years, making this year a leap year, where, in addition to February ...

  9. 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 .