ISO 8601 - Data elements and interchange formats -- Information interchange -- Representation of dates and times - "is applicable whenever representation of dates in the Gregorian calendar, times in the 24-hour timekeeping system, time intervals and recurring time intervals or of the formats of these representations are included in information interchange. ..."
ISO site, "ISO 8601:2004," http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=40874
Wikipedia, "ISO 8601," http://en.wikipedia.org/wiki/ISO_8601
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