[Octave-bug-tracker] [bug #36954] datenum converts date string incorrectly during DST start

[Mike Miller]

Follow-up Comment #13, bug #36954 (project octave):

Adding 2 calls to regexprep and a call to strftime in the critical path of
datevec seems like it might add some overhead to every datenum / datevec call,
whether or not they are affect. I'm interested in timings with and without
this patch.

When looking at bug #51340, I wondered if we might add a parameter to strptime
to indicate that it should ignore the local time zone internally.

Another option might be to 'putenv ("TZ", "UTC0")' for the duration of this
operation, and restore it to either unset or previous value. But I'm uncertain
on the safety and raciness of setting / unsetting user environment variables
for sections of code like this.

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