ISO 4031 is a superseded international standard first issued in 1978 by the

International Organization for Standardization The International Organization for Standardization (ISO ) is an international standard development organization composed of representatives from the national standards organizations of member countries. Membership requirements are given in Art ...

. It defined the representation of local time differentials, commonly referred to as time zones. It has since been superseded by

ISO 8601 ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data. It is maintained by the Geneva-based International Organization for Standardization (ISO) and was first published in 1988, w ...

. This newer standard has set out the formats for local time differentials since 1988, so ISO 4031 is no longer in use.

References

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