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 It has been superseded by a second edition "ISO 8601:2000" in 2000, by a third edition "ISO 8601:2004" published on 1 December 2004, and withdrawn and revised by "ISO 8601-1:2019" and "ISO 8601-2:2019" on 25 February 2019. ISO 8601 was prepared by, and is under the direct responsibility of, ISO Technical Committee TC 154.