[Python-Dev] Aware datetime from naive local time Was: Status on PEP-431 Timezones (original) (raw)

Chris Barker chris.barker at noaa.gov
Mon Apr 13 23:12:02 CEST 2015

On Mon, Apr 13, 2015 at 12:14 PM, Alexander Belopolsky < alexander.belopolsky at gmail.com> wrote:

utctime = f( location, utctime )

These are two different problems, and one is much harder than the other! (though both are ugly!) You probably meant "utctime = f( location, walltime)" in the last equation,

oops, yes.

but that would still be wrong.

A somewhat more correct equation would be

utctime = f^(-1)( location, walltime)

In this case I meant "f" as "a function of", so the two fs were not intended to be the same. Yes, one is the inverse of another, and in this case the inverse is not definable (at least not uniquely).

I have no doubt you understand all this (better than I do), I'm just suggesting that in the discussion we find a way to be as clear as possible as to which function is being discussed when.

But anyway -- thanks all for hashing this out -- getting something reasonable into datetime will be very nice.

-Chris

--

Christopher Barker, Ph.D. Oceanographer

Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception

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