ISO 4031 is a supersededinternational standard first issued in 1978 by theInternational Organization for Standardization. It defined the representation of local time differentials, commonly referred to astime zones. It has since been superseded byISO 8601.[1] This newer standard has set out theformats for local time differentials since 1988, so ISO 4031 is no longer in use.
Annex A … From that concept representations of all other date and time values were logically derived; thus, ISO 2014, ISO 3307 and ISO 4031 have been superseded.
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