[docs] [issue29866] Added datetime_diff to datetime.py.

[Decorater]

Decorater added the comment:

Oh, I just realized I forgot to add other if's to each block in case certain parts was 0 but others was not. I also realized I tried to do datetime.datetime.new instead of datetime.datetime.now on the tests.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29866>
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