Possible error with timezone for Saint Pierre/Miquelon?
Hancock, David (dhancock)
dhancock at arinc.com
Mon Mar 17 16:03:18 UTC 2008
We have fixed this by hand-entering the timezone name as "America/Miquelon."
The web server we used to obtain the timezone (given lat/lon coordinates)
gave "Etc/GMT-3" and that was the primary source of our confusion.
Thanks for enduring my new-to-timezones questions, and
Cheers!
--
David Hancock | dhancock at arinc.com
> From: "Hancock, David (DHANCOCK)" <DHANCOCK at arinc.com>
> Date: Thu, 13 Mar 2008 11:43:10 -0400
> To: <tz at elsie.nci.nih.gov>, <tz at lecserver.nci.nih.gov>, "Raymond, Bill
> (BRAYMOND)" <BRAYMOND at arinc.com>
> Conversation: Possible error with timezone for Saint Pierre/Miquelon?
> Subject: RE: Possible error with timezone for Saint Pierre/Miquelon?
>
> Chris: Thanks for the note. We are using a Python wrapper around the TZ
> database. I will have a look at the chain starting from our side to see where
> the "no dst" is being introduced. The library we use gets distributed with a
> copy of the Olson DB, but if we see an update that's newer than the pytz
> distribution, we obtain the newer distribution and put it where pytz looks for
> it.
>
> I'll let you know what I discover from our end. Apologies for blaming the
> database first! We're in the midst of encoding real timezone names for all of
> our airports, and this was the first error that wasn't simply having the name
> incorrect.
>
> I should note, though, that worldtimeengine.com (which uses Olson data and a
> GIS approach for mapping locations to the timezone name) also shows no DST in
> 2008, but administrative region is Canada. The following URL ends with an
> underscore:
>
> http://worldtimeengine.com/doTime/miquelon_st_pierre_and_miquelon_saint_pierre
> _miquelon_
>
> Thanks, and
> Cheers!
> --
> David Hancock | dhancock at arinc.com
>
>
> -----Original Message-----
> From: Chris Walton [mailto:Chris.Walton at telus.com]
> Sent: Thursday, March 13, 2008 11:26 AM
> To: tz at lecserver.nci.nih.gov; Hancock, David (DHANCOCK); Raymond, Bill
> (BRAYMOND)
> Subject: RE: Possible error with timezone for Saint Pierre/Miquelon?
>
> I am unable to replicate the "Saint Pierre/Miquelon" problem reported by David
> Hancock and Bill Raymond.
>
> America/Miquelon is configured to follow the "Canada" ruleset. Daylight saving
> in Canada started on March 9 this year.
> Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
> -4:00 - AST 1980 May
> -3:00 - PMST 1987 # Pierre & Miquelon Time
> -3:00 Canada PM%sT
>
> # TZ=America/Miquelon date '+%Z %z'
> PMDT -0200
>
> # zdump -v America/Miquelon | grep 2008
> America/Miquelon Thu Mar 13 15:04:41 2008 UTC = Thu Mar 13 13:04:41 2008 PMDT
> isdst=1
> America/Miquelon Sun Mar 9 04:59:59 2008 UTC = Sun Mar 9 01:59:59 2008 PMST
> isdst=0
> America/Miquelon Sun Mar 9 05:00:00 2008 UTC = Sun Mar 9 03:00:00 2008 PMDT
> isdst=1
> America/Miquelon Sun Nov 2 03:59:59 2008 UTC = Sun Nov 2 01:59:59 2008 PMDT
> isdst=1
> America/Miquelon Sun Nov 2 04:00:00 2008 UTC = Sun Nov 2 01:00:00 2008 PMST
> isdst=0
>
> David and/or Bill,
> Are you using standard compiled zone files with a standard C library?
> Or are you doing something more complex that might have introduced an error?
>
> -chris
> -----Original Message-----
> From: Olson, Arthur David (NIH/NCI) [E] [mailto:olsona at dc37a.nci.nih.gov]
> Sent: March 13, 2008 9:19 AM
> To: tz at lecserver.nci.nih.gov
> Subject: FW: Possible error with timezone for Saint Pierre/Miquelon?
>
> I'm forwarding this message from David Hancock; since sending it, he has asked
> to be added to the time zone mailing list and has been added.
>
> --ado
>
> From: Hancock, David (dhancock) [mailto:dhancock at arinc.com]
> Sent: Thursday, March 13, 2008 8:05
> To: tz at lecserver.nci.nih.gov
> Cc: Raymond, Bill (BRAYMOND)
> Subject: Possible error with timezone for Saint Pierre/Miquelon?
>
> Please see the note below from one of my colleagues, Bill Raymond. He was
> following up on a discrepancy in our airport local-time lookup for one of the
> airports our customers use. He verified that the island follows DST by calling
> the airport authority there. Neither of us knows the start and end
> dates for DST, though.
> One of our destination airports is LFVP - Saint Pierre/Miquelon. There is a
> timezone America/Miquelon but the current setting is GMT -3 with no DST. LFVP
> is currently is DST and is GMT -2. It looks like the Olson data has DST info
> for 2007 but not for 2008. I did check several sources to
> confirm, including making a call to Air St. Pierre at the airport to check
> local time.
>
> For now I set LFVP to Etc/GMT -2. Please let me know if there will be an
> update.
>
> We recently integrated the timezone DB into our flight-planning site and it's
> working out very well. We've also been using worldtimeengine.com, which is
> great for obtaining timezone information using latitude and longitude.
>
> Cheers!
> --
> David Hancock | dhancock at arinc.com
>
>
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