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In general, ISO 8601 applies to representations and formats of dates in the Gregorian (and potentially proleptic Gregorian) calendar, times based on the 24-hour timekeeping system (including optional time zone information), time intervals and combinations thereof.
Although the standard allows both the YYYY-MM-DD and YYYYMMDD formats for complete calendar date representations, if the day [DD] is omitted then only the Week date representations are in the format as shown in the adjacent box.
[YYYY] indicates the ISO week-numbering year which is slightly different from the traditional Gregorian calendar year (see below).
It therefore represents years from 0000 to 9999, year 0000 being equal to 1 BC and all others AD.
However, years prior to 1583 are not automatically allowed by the standard.