Pending changes to time of Newfoundland Time Zone for Daylight Savings Time
Chris.Walton at telus.com
Fri Aug 5 22:06:06 UTC 2011
You are correct. The intention is to move the change from 12:01am to 2:00am.
This would conform with the rest of North America.
You asked where the "time of change" is recorded in "this data".
I am not sure if your use of the word "data" refers to the current TZ database, my patch, or the legislation.
So I will try answer to all three.
Bill 6 very specifically states "AN ACT TO AMEND THE STANDARD TIME ACT". i.e. it does not stand by itself.
The current Standard Time Act which you quoted yourself currently spells out 12:01 in nice long text:
"...between one minute after 12 a.m. of the second Sunday in March and one minute after 12 a.m. of...".
The current TZ database does currently accommodate for the 12:01 change. It is embedded into the "StJohns" rule from 1987 onwards.
Perhaps the dates prior to 1987 should reflect the change to; I can't speak to that.
The proposed patch (which we can't theoretically implement until Proclamation occurs) simply switches America/St_Johns and America/Goose_Bay from the "StJohns" rule to the "Canada" rule on Nov 6/2011.
The result is this:
$ zdump -v America/St_Johns | grep 201
America/St_Johns Sun Mar 14 03:30:59 2010 UTC = Sun Mar 14 00:00:59 2010 NST isdst=0 gmtoff=-12600
America/St_Johns Sun Mar 14 03:31:00 2010 UTC = Sun Mar 14 01:01:00 2010 NDT isdst=1 gmtoff=-9000
America/St_Johns Sun Nov 7 02:30:59 2010 UTC = Sun Nov 7 00:00:59 2010 NDT isdst=1 gmtoff=-9000
America/St_Johns Sun Nov 7 02:31:00 2010 UTC = Sat Nov 6 23:01:00 2010 NST isdst=0 gmtoff=-12600
America/St_Johns Sun Mar 13 03:30:59 2011 UTC = Sun Mar 13 00:00:59 2011 NST isdst=0 gmtoff=-12600
America/St_Johns Sun Mar 13 03:31:00 2011 UTC = Sun Mar 13 01:01:00 2011 NDT isdst=1 gmtoff=-9000
America/St_Johns Sun Nov 6 04:29:59 2011 UTC = Sun Nov 6 01:59:59 2011 NDT isdst=1 gmtoff=-9000
America/St_Johns Sun Nov 6 04:30:00 2011 UTC = Sun Nov 6 01:00:00 2011 NST isdst=0 gmtoff=-12600
America/St_Johns Sun Mar 11 05:29:59 2012 UTC = Sun Mar 11 01:59:59 2012 NST isdst=0 gmtoff=-12600
America/St_Johns Sun Mar 11 05:30:00 2012 UTC = Sun Mar 11 03:00:00 2012 NDT isdst=1 gmtoff=-9000
America/St_Johns Sun Nov 4 04:29:59 2012 UTC = Sun Nov 4 01:59:59 2012 NDT isdst=1 gmtoff=-9000
America/St_Johns Sun Nov 4 04:30:00 2012 UTC = Sun Nov 4 01:00:00 2012 NST isdst=0 gmtoff=-12600
Official legislated time in Newfoundland and Labrador is always "Newfoundland Time" (NST/NDT).
None of the Legislation caters to the fact that much of Labrador observes Atlantic Time (AST/ADT).
From: Jonathan Leffler [mailto:jonathan.leffler at gmail.com]
Sent: August 5, 2011 5:21 PM
To: tz at elsie.nci.nih.gov
Cc: mpelley at gov.nl.ca; Chris Walton
Subject: Re: Pending changes to time of Newfoundland Time Zone for Daylight Savings Time
Where is the 'time of change' recorded in this data?
As I understand the legislation, having found http://www.assembly.nl.ca/legislation/sr/statutes/s23.htm (which is, I think, the current Standard Time Act), the intent is to alter the local time at which the switch is made from the unusual 12:01 am to the more normal 02:00 am. It is not clear to me that the existing table recognizes this as the time when the change occurs. I don't think the offsets from UTC (Greenwich Mean Solar Time is mentioned in the statute) change; it is 2.5 hours west of (behind) UTC during daylight time and 3.5 hours west of (behind) UTC during standard time.
s23.htm says in part:
2. (1) Time in the province shall be reckoned as 3 1/2 hours later than Greenwich mean solar time.
(2) Time reckoned in accordance with subsection (1) shall be known as "Newfoundland Standard Time".
RSN1970 c270 s2
3. (1) During the period in each year that the Lieutenant-Governor in Council may by regulation establish, time in the province shall be reckoned as 2 1/2 hours later than Greenwich mean solar time.
(1.1) Notwithstanding subsection (1), beginning in the year 2007 and continuing until changed under subsection (1), during the period in each year between one minute after 12 a.m. of the second Sunday in March and one minute after 12 a.m. of the first Sunday in November time in the province shall be reckoned as 2 1/2 hours later than Greenwich mean solar time.
(2) Time reckoned in accordance with subsection (1) shall be known as "Newfoundland Daylight Time".
RSN1970 c270 s3; 1987 c3 s1; 2006 c31 s1
The amended section 3(1.1) reads:
(1.1) Until changed under subsection (1), during the period in each year between 2 a.m. of the second Sunday in March and 2 a.m. of the first Sunday in November time in the province shall be reckoned as 2 1/2 hours later than Greenwich mean solar time.
It will be interesting working backwards to the 1970 act to see what other changes have been made over the years, and whether the historical data is accurate.
On Fri, Aug 5, 2011 at 14:07, Chris Walton <Chris.Walton at telus.com> wrote:
Bill 6 received Royal Assent on May 31/2011.
Section 2 of Bill 6 states:
"This Act comes into force on a day to be proclaimed by the Lieutenant-Governor in Council."
Do we expect Bill 6 to receive proclamation "before" or "after" to the next clock change?
i.e. will proclamation take place prior to Nov 6/2011?
Assuming the Bill is proclaimed prior to Nov 6/2001, a patch to the northamerica file might look something like this:
--- old/northamerica 2011-06-15 11:05:20.000000000 +0000
+++ new/northamerica 2011-08-05 20:04:17.000000000 +0000
@@ -1178,7 +1178,8 @@
-3:30:52 StJohns N%sT 1935 Mar 30
-3:30 StJohns N%sT 1942 May 11
-3:30 Canada N%sT 1946
- -3:30 StJohns N%sT
+ -3:30 StJohns N%sT 2011 Nov 6
+ -3:30 Canada N%sT
# most of east Labrador
@@ -1192,7 +1193,8 @@
-3:30 StJohns N%sT 1942 May 11
-3:30 Canada N%sT 1946
-3:30 StJohns N%sT 1966 Mar 15 2:00
- -4:00 StJohns A%sT
+ -4:00 StJohns A%sT 2011 Nov 6
+ -4:00 Canada A%sT
# west Labrador, Nova Scotia, Prince Edward I
From: Olson, Arthur David (NIH/NCI) [E] [mailto:olsona at dc37a.nci.nih.gov]
Sent: August 5, 2011 2:54 PM
To: 'tz at elsie.nci.nih.gov'
Cc: 'mpelley at gov.nl.ca'
Subject: FW: Pending changes to time of Newfoundland Time Zone for Daylight Savings Time
I'm forwarding this message from Michael Pelley, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately.
Once we learn that the proclamation has been issued, the changes should up at ftp://elsie.nci.nih.gov/pub about two weeks later.
>From there propagation depends on database users.
From: Pelley, Michael [mailto:MPelley at gov.nl.ca]
Sent: Friday, August 05, 2011 12:43
To: tz at lecserver.nci.nih.gov
Subject: Pending changes to time of Newfoundland Time Zone for Daylight Savings Time
The Government of Newfoundland and Labrador has pending changes to modify the hour for daylight savings time to come into effect in November 2011. This modification would change the time from 12:01AM to 2:00AM on the dates of the switches of Daylight Savings Time to/from Standard Time.
As a matter of reference, in Canada provinces have the authority of setting time zone information. The legislation has passed our legislative body ("The House of Assembly") and is awaiting the proclamation to come into effect. You may find this information at: http://www.assembly.nl.ca/legislation/sr/lists/Proclamation.htm and search within that web page for "Standard Time (Amendment) Act". The Act may be found at: http://www.assembly.nl.ca/business/bills/Bill1106.htm
We would appreciate if we could receive some guidance as to:
. The official mechanism for implementing this change;
. The timeframe for the implementation of the change within the TZ sources.
MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
Office of the Chief Information Officer
Government of Newfoundland & Labrador
P.O. Box 8700, 40 Higgins Line, St. John's NL A1B 4J6
709 729-7457 (t) | 709 729-6767 (f) | 709 690-2513 (c) | mpelley at gov.nl.ca
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Jonathan Leffler <jonathan.leffler at gmail.com> #include <disclaimer.h>
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