[tz] Rules for TZ+ database

Patrice Scattolin patrice.scattolin at oracle.com
Mon Sep 9 13:09:31 UTC 2013

Airlines aren't without their flaws. I did see a flight that was 
magically 1h shorter than all the others. Reason: DST to ST switchover 
was occurring during the flight and the reservation system didn't take 
that into account in their computation of the time of flight. That said, 
you would think that scheduling is an area where airlines pay particular 

So it doesn't really matter if you store the meeting time in UTC, local 
time + TZ or Julian Dates, these are all monotonic. The question is if 
you have the all the needed information to convert from one form to the 
next correctly so that this UTC flight time correspond to the correct 
arrival time in local time.

On 06/09/2013 6:03 PM, Clive D.W. Feather wrote:
> random832 at fastmail.us said:
>> Yeah, but if you've got a flight that takes a set amount of time, and
>> one of the endpoints switches zones and the other doesn't, you'd have to
>> reschedule one of them anyway. Airlines are the one place I think it
>> _would_ make sense to schedule everything in UTC. The only situation it
>> wouldn't is if both endpoints make the same change (as when the whole US
>> changed its daylight saving rules).
>> Do we have any airline people here who can comment?
> Back when you could visit the flight deck on trans-Atlantic flights, I
> often did so. Sometimes I'd look at the flight planning printout, which
> gave scheduled times at various checkpoints en route (from memory these are
> about every 5 degrees of longitude). All times were in Zulu.


Oracle Email Signature Logo
Patrice Scattolin | Principal Member Technical Staff | 514.905.8744
Oracle WebCenter Mobile applications
600 Blvd de Maisonneuve West
Suite 1900
Montreal, Quebec
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mm.icann.org/pipermail/tz/attachments/20130909/e65b6065/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: oracle_sig_logo.gif
Type: image/gif
Size: 658 bytes
Desc: not available
URL: <http://mm.icann.org/pipermail/tz/attachments/20130909/e65b6065/oracle_sig_logo.gif>

More information about the tz mailing list