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bpo-28602: [WIP] Add fold support to fromutc#7425
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This is an example implementation of generic fold support in
datetime.fromutc
, for purposes of discussion. The idea here is that so long asutcoffset - dst
is constant (as is the fundamental assumption of the currentfromutc
implementation) and theutcoffset
anddst
implementations respect thefold
parameter, this will always set thefold
parameter correctly infromutc
.This needs more extensive tests and a pure Python implementation (plus I don't think I was amazingly careful about the reference counts), but the overall outline is there. It's basically a port of the current basedateutil implementation.
SeeGH-72788.
https://bugs.python.org/issue28602