Data elements and interchange formats - Information interchange - Representation of dates and times
ISO 8601:2004 is an international standard covering the exchange of date and time-related data. 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 is transferred between countries with different conventions for writing numeric dates and times. ISO 8601:2004 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.
3/2018: Currently under review. Will be replaced by ISO / DIS 8601-1 and ISO / DIS 8601-2.