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A year, a W and a week number.
Also known as: Week number notation, ISO week
The ISO week date numbers weeks from one to fifty-two or fifty-three, with week one being the week containing the first Thursday of the year. That rule means the first days of January can fall in the last week of the previous ISO year, which is a real and frequent source of confusion.
Names a date by year, week number and weekday, with a W separating the year from the week.
Contexts: Technical drawing, Maps
Defines week one as the week containing the first Thursday of the year, so early January can belong to the previous ISO week-year.
Contexts: Technical drawing, Maps
Four numerals, a hyphen, a capital W, two numerals and optionally a hyphen and one more numeral.