Possible error with timezone for Saint Pierre/Miquelon?

Chris Walton Chris.Walton at telus.com
Thu Mar 13 15:26:05 UTC 2008

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?

-----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.


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.

David Hancock | dhancock at arinc.com

More information about the tz mailing list