[docs] [issue7229] Manual entry for time.daylight can be misleading

Alexander Belopolsky report at bugs.python.org
Sat Jun 5 19:43:59 CEST 2010

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

On Sat, Jun 5, 2010 at 1:24 PM, anatoly techtonik
<report at bugs.python.org> wrote:
> As for offtopic UTC vs GMT - I doubt there is a way to clearly express that the offset sign of the
> returned values is negated in comparison with real "UTC offsets" without resorting to some
> king of alternative east/west scale.

Sure there is.  Here is how RFC 3339 handles this:

   Numeric offsets are calculated as "local time minus UTC".  So the
   equivalent time in UTC can be determined by subtracting the offset
   from the local time.

and here is a quote from MacOS man page for tzset:

           offset       Indicates the value one must add to the local
time to arrive at Coor-
                        dinated Universal Time.

No geographic reference needed.  (And the issue is not UTC vs. GMT:
both UTC and GMT are timescales, sometimes even considered the same.
The off-topic issue is UTC vs. Prime Meridian.)


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