Calendar by week number1/4/2024 If 1 January is on a Friday, Saturday or Sunday, it is in week 52 or 53 of the previous year. If 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01.the week with the Thursday in the period 1 - 7 January. the week starting with the Monday in the period 29 December - 4 January.the first week with the majority (four or more) of its days in the starting year.the week with the year's first working day in it (if Saturdays, Sundays, and 1 January are no working days).the week with the year's first Thursday in it.Mutually equivalent definitions for week 01 are: In the period 4 January–28 December and on all Thursdays the ISO year number is always equal to the Gregorian year number. The ISO year number deviates from the number of the Gregorian year on, if applicable, a Friday, Saturday, and Sunday, or a Saturday and Sunday, or just a Sunday, at the start of the Gregorian year (which are at the end of the previous ISO year) and a Monday, Tuesday and Wednesday, or a Monday and Tuesday, or just a Monday, at the end of the Gregorian year (which are in week 01 of the next ISO year). 1.3 Examples where the ISO year is three days into the previous Gregorian year.1.2 Examples where the ISO year is three days into the next Gregorian year.Since non-leap years have 52 weeks, in every 400 years there are 71 leap years. The system has a 400-year cycle of 146,097 days (20,871 weeks), with an average year length of exactly 365.2425 days, just like the Gregorian calendar. In the Gregorian system this day is called December 31, 2006. For example, 2006-W52-7 (or in its most compact form 06W527) is the Sunday of the 52nd week of 2006. The extra week is called a leap week, a year with such a week a leap year.Ī date is specified by the ISO year in the format YYYY, a week number in the format ww prefixed by the letter W, and the weekday number, a digit d from 1 through 7, beginning with Monday and ending with Sunday. An ISO year has 52 or 53 full weeks (364 or 371 days). ISO years have a year numbering which is approximately the same as the Gregorian years, but not exactly (see below). The system uses the same cycle of 7 weekdays as the Gregorian calendar. The system is used (mainly) in government and business for fiscal years, as well as in timekeeping. The ISO week date system is a leap week calendar system that is part of the ISO 8601 date and time standard. As with the Calendar Wikia, the text of Wikipedia is available under Creative Commons License. The list of authors can be seen in the page history. The original article was at ISO week date. This page uses content from the English Wikipedia.
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