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Add What's New entry for date subclass behavior (#11790) 

This was a backwards incompatible change and should be clearly noted.

Related bugs:

bpo-32417: https://bugs.python.org/issue32417
bpo-35364: https://bugs.python.org/issue35364
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Paul Ganssle 2019-02-08 11:02:00 -05:00 committed by Łukasz Langa
parent 96d37dbcd2
commit d9503c307a
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Doc/whatsnew/3.8.rst
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@ -115,6 +115,14 @@ Other Language Changes
a :exc:`SyntaxWarning` instead.
(Contributed by Serhiy Storchaka in :issue:`32912`.)
* Arithmetic operations between subclasses of :class:`datetime.date` or
:class:`datetime.datetime` and :class:`datetime.timedelta` objects now return
an instance of the subclass, rather than the base class. This also affects
the return type of operations whose implementation (directly or indirectly)
uses :class:`datetime.timedelta` arithmetic, such as
:meth:`datetime.datetime.astimezone`.
(Contributed by Paul Ganssle in :issue:`32417`.)
New Modules
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