Hmm, ok. I guess I was confused by "dates and times" part of the subject. Ok, so only datetimes. My other comments still apply though. 

> On 19 Jul 2016, at 16:20, Mathieu Dupuy <report@bugs.python.org> wrote:
> 
> 
> Mathieu Dupuy added the comment:
> 
> because it limits itself to only support the RFC 3339 subset, as
> explained in the begining of the discussion.
> 
> 2016-07-19 16:07 GMT+02:00 Anders Hovmöller <report@bugs.python.org>:
>> 
>> Anders Hovmöller added the comment:
>> 
>> The tests attached to this ticket seem pretty bare. Issues that I can spot directly:
>> 
>> - only tests for datetimes, not times or dates
>> - only tests for zulu and "-8:00” timezones
>> - no tests for invalid input (parsing a valid date as a datetime for example)
>> - only tests for YYYY-MM-DDTHH:MM:SSZ, but ISO8601 supports:
>>    - Naive times
>>    - Timezone information (specified as offsets or as Z for 0 offset)
>>    - Year
>>    - Year-month
>>    - Year-month-date
>>    - Year-week
>>    - Year-week-weekday
>>    - Year-ordinal day
>>    - Hour
>>    - Hour-minute
>>    - Hour-minute
>>    - Hour-minute-second
>>    - Hour-minute-second-microsecond
>>    - All combinations of the three "families" above!
>> (the above list is a copy paste from my project that implements all ISO8601 that fits into native python: https://github.com/boxed/iso8601 <https://github.com/boxed/iso8601>)
>> 
>> This is a more reasonable test suite: https://github.com/boxed/iso8601/blob/master/iso8601.py#L166 <https://github.com/boxed/iso8601/blob/master/iso8601.py#L166> although it lacks the tests for bogus inputs.
>> 
>>> On 2016-07-16, at 03:41, Alexander Belopolsky <report@bugs.python.org> wrote:
>>> 
>>> 
>>> Alexander Belopolsky added the comment:
>>> 
>>> I would very much like to see this ready before the feature cut-off for Python 3.6.  Could someone post a summary on python-ideas to get a show of hands on some of the remaining wrinkles?
>>> 
>>> I would not worry about a C implementation at this point.  We can put python implementation in _strptime.py and call it from C as we do for the strptime method.
>>> 
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