Hi Rob,

The fact DjangoJSONEncoder strips microseconds is definitely a bug that 
should
be reported:

> e.default(datetime.datetime(year=2016, month=1, day=1, hour=1, minute=1, 
second=1, microsecond=123456))
> '2016-01-01T01:01:01.123'

I think always including the microseconds could make sense but I'm not sure 
it's
worth it in regard to backward incompatiblity. Keep in mind that Django 
relies
on the `datetime.datetime.isoformat` stdlib method which does the stripping
internally:

> datetime.datetime(year=2016, month=1, day=1, hour=1, minute=1, 
second=1).isoformat()
> '2016-01-01T01:01:01'

Cheers,
Simon

> e.default(datetime.datetime(year=2016, month=1, day=1, hour=1, minute=1, 
second=1, microsecond=123456))
> '2016-01-01T01:01:01.123'

I think always including the microseconds could make sense but since it 
might have backward compatibility 

Le jeudi 10 mars 2016 07:52:49 UTC-5, Robert Kirberich a écrit :
>
> Hi,
>
> I stumbled across this yesterday while trying to figure out why some of my 
> tests would sometimes fail when serializing and deserializing datetimes to 
> JSON.
>
> DjangoJSONSerializer only includes the milliseconds in the encoded string 
> if the original datetime has a non-zero microsecond value - this is fine 
> when only dealing with the JSON in Javascript, but in python it requires 
> two different cases when decoding.
>
> To make things even more confusing, the milliseconds field can be included 
> even if it's zero:
>
> import datetime
> from django.core.serializers.json import DjangoJSONEncoder
> e = DjangoJSONEncoder()
>
> e.default(datetime.datetime(year=2016, month=1, day=1, hour=1, minute=1, 
> second=1, microsecond=1))
> '2016-01-01T01:01:01.000'
>
> e.default(datetime.datetime(year=2016, month=1, day=1, hour=1, minute=1, 
> second=1, microsecond=0))
> '2016-01-01T01:01:01'
>
>
>
> This seems like a bug to me (easily fixed by always including the 
> milliseconds), but I wanted to check first if there's a reason for this 
> behaviour, as that code has been there for ages. If this is a bug, I'll be 
> happy to send a PR.
>
>
> Cheers
> Rob
>

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