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ISO 8601 ''Data elements and interchange formats – Information interchange – Representation of dates and times'' is an international standard covering the exchange of date and time-related data. It was issued by the International Organization for Standardization (ISO) and was first published in 1988. The purpose of this standard is to provide an unambiguous and well-defined method of representing dates and times, so as to avoid misinterpretation of numeric representations of dates and times, particularly when data are transferred between countries with different conventions for writing numeric dates and times. 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.〔ISO 8601:2004() section 1 Scope〕 The standard does not assign any specific meaning to elements of the date/time to be represented; the meaning will depend on the context of its use. In addition, dates and times to be represented cannot include words with no specified numerical meaning in the standard (e.g. names of years in the Chinese calendar) or that do not use characters (e.g. images, sounds).〔 In representations for interchange, dates and times are arranged so the largest temporal term (the year) is placed to the left and each successively smaller term is placed to the right of the previous term. Representations must be written in a combination of Arabic numerals and certain characters (such as "-", "W", and "Z") that are given specific meanings within the standard; The implication is that some commonplace ways of writing parts of dates, such as "January" or "Thursday", are not allowed in interchange representations. } |} ==History== The first edition of the ISO 8601 standard was published as ''ISO 8601:1988'' in 1988. It unified and replaced a number of older ISO standards on various aspects of date and time notation: ISO 2014, ISO 2015, ISO 2711, ISO 3307, and ISO 4031. It has been superseded by a second edition ''ISO 8601:2000'' in 2000 and by the current third edition ''ISO 8601:2004'' published on 3 December 2004. ISO 8601 was prepared by, and is under the direct responsibility of, ISO Technical Committee TC 154.〔(TC 154 Processes, data elements and documents in commerce, industry and administration ), Technical committeesISO〕 ISO 2014, though superseded, is the standard that originally introduced the all-numeric date notation in most-to-least-significant order . The ISO week numbering system was introduced in ISO 2015, and the identification of days by ordinal dates was originally defined in ISO 2711. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ISO 8601」の詳細全文を読む スポンサード リンク
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