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  2. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    With the exception of leap years starting on Thursday, dates with fixed week numbers occur in all months of the year (for 1 day of each ISO week W01 to W52). During leap years starting on Thursday (i.e. the 13 years numbered 004, 032, 060, 088, 128, 156, 184, 224, 252, 280, 320, 348, 376 in a 400-year cycle), the ISO week numbers are ...

  3. 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]

  4. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    An ISO week-numbering year has 52 or 53 full weeks. That is 364 or 371 days instead of the conventional Gregorian year of 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 the 1 January.

  5. Leap year starting on Friday - Wikipedia

    en.wikipedia.org/wiki/Leap_year_starting_on_Friday

    This is the only type of leap year when Valentine’s Day falls in ISO week 6. They fall in ISO week 7 in all other leap years. The leap day (February 29) falls on a Monday; World Day for Grandparents and the Elderly falls on July 24; Halloween falls on a Monday; Christmas Day falls on a Sunday. This is the only type of leap year when Christmas ...

  6. 4–4–5 calendar - Wikipedia

    en.wikipedia.org/wiki/4–4–5_calendar

    In particular, the last fiscal week is the one that includes August 28 and the first fiscal week of the following year is the one that includes September 4. For Saturday, this ends up being equivalent to the week-date rule from ISO 8601 which ensures that the first week of the year contains four or more days (i.e. its majority) of that year ...

  7. Is 2024 a leap year? When is leap day, and why is it needed?

    www.aol.com/2024-leap-leap-day-why-204215160.html

    A leap year is a year in which an extra day, Feb. 29, is added to the calendar. It's called an intercalary day. It occurs about every four years, but there are exceptions (we'll get to that later).

  8. Week - Wikipedia

    en.wikipedia.org/wiki/Week

    A week is defined as an interval of exactly seven days, [b] so that, except when passing through daylight saving time transitions or leap seconds, 1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds. With respect to the Gregorian calendar: 1 Gregorian calendar year = 52 weeks + 1 day (2 days in a leap 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.