ISO 8601-2:2019,Date and time — Representations for information interchange — Part 2: Extensions.
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The purpose of this document is to provide a set of date and time format representations for information interchange beyond those supported by IS0 8601-1.
There are various concepts and representations that many applications find useful not supported by IS0 8601-1.
ISO 8601-2:2019 excludes the representation of date elements from non-Gregorian calendars, or times not from the 24-hour clock. This document does not address character encoding of representations specified in this document.
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