[issue9051] Improve pickle format for timezone aware datetime instances

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

For now "_utc" is not a part of API. When use it in pickling, you implicitly make it a part of API, and should support it forever (and force other Python implementations to support it). As far as it looks as implementation detail, there is a risk that the "_utc" variable can be renamed and this will break pickle compatibility.

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<http://bugs.python.org/issue9051>
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