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The last week of the ISO week-numbering year, i.e. W52 or W53, is the week before W01 of the next year. This week's properties are: It has the year's last Thursday in it. It is the last week with a majority (4 or more) of its days in December. Its middle day, Thursday, falls in the ending year. Its last day is the Sunday nearest to 31 December.
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]
ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]
I have seen ISO 8601:2000 but not ISO 8601:2004. ISO 8601:2000 does not use the term "leap week"; I don't know whether ISO 8601:2004 does. Unless the term is introduced in ISO 8601:2004, it seems to me unwise to introduce it elsewhere; "week 53" suffices. It leads to using "leap year" for 53-week years, which clashes with conventional use.
Which years are leap years and common years and how they differ. Numbering of years, selection of the epoch, and the issue of year zero. Start of the year (such as the December solstice, January 1, March 1, March equinox, Lady Day). If a week is retained, the start, length, and names of its days. Start of the day (midnight, sunrise, noon, or ...
Hanke–Henry Permanent Calendar pre-2016 version with weeks still starting Sunday, but Xtra already at the end of the year. In 2004, Richard Conn Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time (CCC&T), which he described as a modification to a proposal by Robert McClenon.