Martin Panter <vadmium...@gmail.com> added the comment:

Regarding Matthieu’s RFC 3339 parser, Victor wanted to use the 
round-half-to-even rule to get a whole number of microseconds. But considering 
the “time” class cannot represent 24:00, how do you round up in the extreme 
case past 23:59?

time.fromisoformat("23:59:59.9999995")

Perhaps it is better to always truncate to zero, only support 6 digits 
(rejecting fractions of a microsecond), or add Anders’s 
truncate_microseconds=True option.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue15873>
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