ISO 4031
Encyclopedia
ISO 4031 is a standard superseded by ISO 8601
ISO 8601
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 and was first published in 1988...

. Representations of local time differentials were originally specified in ISO 4031. The standard was issued in 1978.
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