[issue9527] Add aware local time support to datetime module

[Alexander Belopolsky]

Alexander Belopolsky <alexander.belopolsky at gmail.com> added the comment:

Two objections have been raised to the proposed datetime.localtime() function:

1. It offers the third subtly different way to obtain current time in datetime module.  The first two being provided by datetime.now() and datetime.today().

2. C library localtime function takes POSIX timestamp as an argument, so datetime.localtime() should follow suit.

I attach a prototype patch for a different approach: make datetime.astimezone() method supply local timezone information if no argument is given.

This patch also demonstrates that extracting all TZ information that platform may have knowledge of is not trivial.

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Added file: http://bugs.python.org/file25939/datetime-astimezone-proto.diff

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