ISO 4031 is a superseded
international standard first issued in 1978 by the
International Organization for Standardization. It defined the representation of local time differentials, commonly referred to as
time zones. It has since been superseded by
ISO 8601.
This newer standard has set out the
formats for local time differentials since 1988, so ISO 4031 is no longer in use.
References
#04031
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