[issue37962] Improve ISO 8601 timezone support in the datetime.fromisoformat() method

[Zeth]

New submission from Zeth <theology at gmail.com>:

The datetime.datetime.fromisoformat() method unnecessarily rejects datetime strings that are valid under ISO 8601 if timezone uses the UTC  designator or it only has hours.

In ISO 8601, section 4.2.5.1: "When it is required to indicate the difference between local time and UTC of day, the representation of the difference can be expressed in hours and minutes, or hours only."

And Section 4.2.4, UTC shall be expressed "by the UTC designator [Z]".

A key use case of the latter is being able to parse JavaScript Date objects (e.g. dates that have come from a web frontend or a JSON document). This considerably improves the usefulness of the datetime.fromisoformat method.

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messages: 350630
nosy: zeth
priority: normal
pull_requests: 15224
severity: normal
status: open
title: Improve ISO 8601 timezone support in the datetime.fromisoformat() method

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37962>
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