ISO 8601 - Dates

Dates

November 2012
Wk Mo Tu We Th Fr Sa Su
(44) 29 30 31 1 2 3 4
(45) 5 6 7 8 9 10 11
(46) 12 13 14 15 16 17 18
(47) 19 20 21 22 23 24 25
(48) 26 27 28 29 30 1 2

The standard uses the Gregorian calendar, which serves as an international standard for civil use.

ISO 8601 fixes a reference calendar date to the Gregorian calendar of 20 May 1875 as the date the Convention du Mètre (Metre Convention) was signed in Paris. However, ISO calendar dates before the Convention are still compatible with the Gregorian calendar all the way back to the official introduction of the Gregorian calendar on 1582-10-15. Earlier dates, in the proleptic Gregorian calendar, may be used by mutual agreement of the partners exchanging information. The standard states that every date must be consecutive, so usage of the Julian calendar would be contrary to the standard (because at the switchover date, the dates would not be consecutive).

Read more about this topic:  ISO 8601

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