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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, 9 February 2025 corresponds to day number 7 in the week number 06 of ...
ISO 2014, though superseded, is the standard that originally introduced the all-numeric date notation in most-to-least-significant order [YYYY]-[MM]-[DD]. The ISO week numbering system was introduced in ISO 2015, and the identification of days by ordinal dates was originally defined in ISO 2711.
Quite often, these systems will agree on the week number for each day in a workweek: In years where 1 January is a Monday, Tuesday, Wednesday, or Thursday, all of the above week numbering systems will agree. In years where 1 January is a Friday, ISO-8601 will be different, but the rest will agree.
Companies in Europe often use year, week number, and day for planning purposes. So, for example, an event in a project can happen on w43 (week 43) or w43-1 (Monday, week 43) or, if the year needs to be indicated, on w0643 (the year 2006, week 43; i.e., Monday 23 October–Sunday 29 October 2006). An ISO week-numbering year has 52 or 53 full ...
Short format: dd/mm/yyyy (Day first, month number and year in left-to-right writing direction) in Afar, French and Somali ("d/m/yy" is a common alternative). Gregorian dates follow the same rules but tend to be written in the yyyy/m/d format (Day first, month number, and year in right-to-left writing direction) in Arabic language.
Dezember 1991) continues to use the little-endian order and the ordinal-number dot for the day of the month. Week numbers according to ISO 8601 and the convention of starting the week on Monday were introduced in the mid 1970s . These conventions have been widely adhered to by German calendar publishers since then.
ISO 2015 is a standard of the International Organization for Standardization (ISO), superseded by ISO standard ISO 8601. [1] The standard ISO week numbering system was introduced in ISO 2015. ISO 2015 was issued as an international standard in 1976, technically identical to ISO Recommendation R 2015, from 1971.
ISO prescribes Monday as the first day of the week with ISO-8601 for software date formats. The Slavic, Baltic and Uralic languages (except Finnish and partially Estonian and Võro) adopted numbering but took Monday rather than Sunday as the "first day". [25]