Invalid datetime.time.fromisoformat

[random1st]

Bug report

Bug description:

According to the standard ISO 8601 Thus the value ‘24:00:00’ is chosen to represent the final instant of the day in order to distinguish the expression of this instant from an expression of a time scale unit.

>>> datetime.time.fromisoformat("24:00")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: hour must be in 0..23

Link to standard pdf

CPython versions tested on:

3.10, 3.12

Operating systems tested on:

Linux, macOS

[eendebakpt]

Some other discussions on supporting this: dotnet/runtime#12197, astropy/astropy#9837

Also note the documentation of datetime.datetime.fromisoformat:

Return a date corresponding to a date_string given in any valid ISO 8601 format, with the following

The part "in any valid ISO 8601" suggest that fromisodate should support 24:00

[tomasr8]

The part "in any valid ISO 8601" suggest that fromisodate should support 24:00

On one hand it says any valid ISO 8601 format (which with the latest amendement to the spec 24:00 is). On the other hand, it also lists exceptions to the spec. Even though I think it would make sense to support 24:00, if it's decided against it, I think we should at least document this discrepancy in the docs

[hugovk]

Is this a duplicate of #102450 (or #54636)?

[eendebakpt]

There is an open PR to allow 24:00: #105856. I can review it (but it would be nice to know beforehand whether we actually want to allow 24:00).

@pganssle @abalkin as code owners