Steve Holden added the comment:

Just wanted to add a couple of comments here in case there's any interest. In 
our missions to make the world's market data available we deal with financial 
exchanges, many of whom are already recording event data at nanosecond 
resolution.

Further, I believe the decision to use a separate nanoseconds field to be 
essentially correct. While  it may well introduce some arithmetical complexity 
its value in backwards compatibility should be regarded as paramount. If I 
understand it correctly, the new nanosecond resolution times would continue to 
be correctly handled (module loss of nanosecond resolution) when handled as 
current microsecond date-times.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15443>
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