Redirects here; you may be looking for,,. The ISO week date system is effectively a system that is part of the date and time standard issued by the (ISO) since 1988 (last revised in 2004) and, before that, it was defined in since 1971. It is used (mainly) in and for, as well as in timekeeping. This was previously known as 'Industrial date coding'.

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The system specifies a week year atop the by defining a notation for ordinal weeks of the year. The Gregorian, which has 97 leap days spread across 400 years, contains a whole number of weeks ( 20 871). In every cycle there are 71 years with an additional 53rd week (corresponding to the Gregorian years that contain 53 Thursdays). An average year is exactly 52.1775 weeks long; months (1/12 year) average at exactly 4.348125 weeks.

An ISO week-numbering year (also called ISO year informally) has 52 or 53 full weeks. Clockwork princess online. That is 364 or 371 days instead of the usual 365 or 366 days. The extra week is sometimes referred to as a, although ISO 8601 does not use this term. Weeks start with Monday. Each week's year is the Gregorian year in which the Thursday falls. The first week of the year, hence, always.

ISO week therefore slightly deviates from the Gregorian for some days close to 1 January. A precise date is specified by the ISO week-numbering 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.

For example, the Gregorian date Sunday 31 December 2006 corresponds to the Sunday of the 52nd week of 2006, and is written 2006-W52-7 (in extended form) or 2006W527 (in compact form). December 2018 Mon Tue Wed Thu Fri Sat Sun W48 26 27 28 29 30 01 02 W49 03 04 05 06 07 08 09 W50 10 11 12 13 14 15 16 W51 17 18 19 20 21 22 23 W52 24 25 26 27 28 29 30 W01 31 01 02 03 04 05 06.