America/Moncton (2007)

Chris Walton Chris.Walton at
Tue Jul 11 15:24:56 UTC 2006

The Canadian rules that appear in tzdata 2006d were actually created with two assumptions:

Assumption #1:
It was assumed that all regions of Canada that observe daylight saving will follow the US dates starting in 2007.
All the Canadian zones that observe daylight saving were updated accordingly.

Assumption #2:
It was assumed that New Brunswick and Newfoundland would continue to switch the clocks at 12:01am as they have done for years.
The first assumption has not been proved right or wrong yet.
We have not heard from governments of:
 Newfoundland & Labrador
 City of Lloydminster
All the other governments have committed to make the change.

The second assumption proved to be incorrect.
Starting in 2007, New Brunswick will be switching the clocks at 2:00am instead of 12:01am.
This means a minor update is required for America/Moncton.
The current rule will force a transition to ADT at 12:01am on March 11/2007 instead of 2:00am on March 11/2007.
I doubt many people are actually using America/Moncton since it was only introduced in 2006a.
Based on the e-mails from Paul I think we can expect to see this fixed in 2006h.

Does this answer everybody's questions?


-----Original Message-----
From: Adrian Loram [mailto:Adrian_Loram at]
Sent: Tue 7/11/2006 4:39 AM
To: tz at
Subject: Re: America/Moncton (2007)

Can you please clarify what Canada changes (in line with the US 2007 DST
changes) are in the current tz update (2006g) and what further ones are
still expected.

On 27 Jun 2006, Chris Walton said:
> Version 2006d of the Olson database was updated to reflect an  assumption
that all
> provinces and territories will eventually follow the US rules by
extending daylight saving.

.. so I had assumed there would be no further update.

Adrian Loram

Paul Eggert <eggert at CS.UCLA.EDU> wrote on 11/07/2006 00:24:20:

> Robbin Kawabata <Robbin.Kawabata at> writes:
> > Do you plan to put out a tz update (2006h?) soon that includes the
> > Canada changes?
> How soon is "soon"?  :-)
> I don't have a schedule and I don't know that Arthur does either.  The
> Moncton and Bermuda changes don't take effect until March 2007, so
> unless I'm missing something they're not that urgent.
> The proposed new Zones America/Blanc-Sablon and America/Atikokan do
> affect current time stamps but these are for small regions that have
> used standard time for decades (we think) so they normally wouldn't
> justify a high-priority update.
> I am hoping for a bit more feedback about these Canadian changes
> before proposing tz updates.  Plus, you never know, those pesky
> Canadian politicians might change their minds again before next year!

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