[Python-Dev] TZ-aware local time (original) (raw)

R. David Murray rdmurray at bitdance.com
Wed Jun 6 04:05:38 CEST 2012

On Tue, 05 Jun 2012 18:31:20 -0700, Glyph <glyph at twistedmatrix.com> wrote:

Le Jun 5, 2012 à 6:16 PM, Nick Coghlan a écrit : > Personally, I'd like to see the datetime module make an explicit > assumption that "all naive datetime objects are considered to be UTC", > with the interactions between naive and aware objects updated > accordingly I would absolutely love it if this were true. In fact, I would go a step further and say that the whole concept of a "naive" datetime is simply a bug. We don't have a "naive" unicode, for example, where it's text in some encoding but you decline to decide which one when you decode it, leaving that to the caller. When we addresed this problem for ourselves at Divmod some time ago, naive=UTC is exactly what we did: <http://bazaar.launchpad.net/~divmod-dev/divmod.org/trunk/files/head:/Epsilon/epsilon/extime.py>

Note that (after several conversations with Alexander, and based on the analogous decision in the email RFCs), the email package makes the same call. A naive datetime is treated as a UTC time with no information about what timezone it originated from (coded as -0000 per RFC 5322), while an aware datetime will generate an accurate offset (+0000 for "really UTC", and as appropriate for others).

So in some sense I've already nudged the stdlib in this direction...unless I get overruled now that I've pointed it out :)

--David

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