New TZ Rules for Daylight Savings Time

Carter Bullard carter at qosient.com
Tue Feb 13 15:19:18 EST 2007


Gentle people,
Matthew raised an interesting issue.  When systems change their rules  
for
daylight savings time, our conversion for historical data could be  
messed up.
Will my system now think to put in a daylight savings adjustment when I
lookup data 3 years ago.  I'll do some investigations, but if anyone  
has any
additional information on say Linux support for changing DST rules, give
a holler.

Just as a followup, if anyone is having an issue with their daylight  
savings time
rules, here are the affected time zones and their new definitions.   
These rules
were defined in 2005, and so most should not have any problems, but  
just in
case, here you go.   Reference:
       http://mail.openvms.org:8100/Lists/alerts/Message/378.html? 
Language.

               TZ Subregion: GB-Eire
                Existing Rule: GB-Eire GMT0BST-1,M3.5.0/1,M10.5.0/1
                Changed Rule: (US DST Extension):  
GMT0BST-1,M3.5.0/1,M10.5.0/2

               TZ Subregion: WET
               Existing Rule: WET0WET_DST-1,M3.5.0/1,M9.5.0/1
               Changed Rule: WET0WEST-1,M3.5.0/1,M10.5.0/2

               TZ Subregion: Iceland
               WET0
               GMT0

               TZ Subregion: MET
               Existing Rule: MET-1MET_DST-2,M3.5.0/2,M10.5.0/3
               Changed Rule: MET-1MEST-2,M3.5.0/2,M10.5.0/3

               TZ Subregion: Poland
               Existing Rule: MET-1MET_DST-2,M3.5.0/1,M9.5.0/1
               Changed Rule: CET-1CEST-2,M3.5.0/1,M10.5.0/2

               TZ Subregion: EET
               Existing Rule: EET-2EET_DST-3,M3.5.0/3,M10.5.0/4
               Changed Rule: EET-2EEST-3,M3.5.0/3,M10.5.0/4

               TZ Subregion: Turkey
               Existing Rule: EET-3EET_DST-4,M3.5.0/1,M9.5.0/1
               Changed Rule: EET-2EEST-3,M3.5.0/3,M10.5.0/4

               TZ Subregion: US/Eastern
               Existing Rule: EST5EDT4,M4.1.0/2,M10.5.0/2
               Changed Rule: EST5EDT4,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/East-Indiana
               Existing Rule: EST5
               Changed Rule: EST5EDT4,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/Central
               Existing Rule: CST6CDT5,M4.1.0/2,M10.5.0/2
               Changed Rule: CST6CDT5,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/Mountain
               Existing Rule: MST7MDT6,M4.1.0/2,M10.5.0/2
               Changed Rule: MST7MDT6,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/Pacific
               Existing Rule: PST8PDT7,M4.1.0/2,M10.5.0/2
               Changed Rule: PST8PDT7,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/Alaska
               Existing Rule: AKST9AKDT8,M4.1.0/2,M10.5.0/2
               Changed Rule: AKST9AKDT8,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/Navajo
               Existing Rule: MST7MDT6,M4.1.0/2,M10.5.0/2
               Changed Rule: MST7MDT6,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/Michigan
               Existing Rule: EST5EDT4,M4.1.0/2,M10.5.0/2
               Changed Rule: EST5EDT4,M3.2.0/02,M11.1.0/02

               TZ Subregion: US/Aleutian
               Existing Rule: HAST10HAST9,M4.1.0/2,M10.5.0/2
               Changed Rule: HAST10HADT9,M3.2.0/02,M11.1.0/02

               TZ Subregion: Canada/Newfoundland
               Existing Rule: NST3:30NDT2:30,M4.1.0/2,M10.5.0/2
               Changed Rule: NST3:30NDT2:30,M3.2.0/0:01,M11.1.0/0:01

               TZ Subregion: Canada/Atlantic
               Existing Rule: AST4ADT3,M4.1.0/2,M10.5.0/2
               Changed Rule: AST4ADT3,M3.2.0/2,M11.1.0/2

               TZ Subregion: Canada/Eastern
               Existing Rule: EST5EDT4,M4.1.0/2,M10.5.0/2
               Changed Rule: EST5EDT4,M3.2.0/2,M11.1.0/2

               TZ Subregion: Canada/Central
               Existing Rule: CST6CDT5,M4.1.0/2,M10.5.0/2
               Changed Rule: CST6CDT5,M3.2.0/2,M11.1.0/2

               TZ Subregion: Canada/Mountain
               Existing Rule: MST7MDT6,M4.1.0/2,M10.5.0/2
               Changed Rule: MST7MDT6,M3.2.0/2,M11.1.0/2

               TZ Subregion: Canada/Pacific
               Existing Rule: PST8PDT7,M4.1.0/2,M10.5.0/2
               Changed Rule: PST8PDT7,M3.2.0/2,M11.1.0/2

               TZ Subregion: Canada/Yukon
               Existing Rule: YST9YDT8,M4.1.0/2,M10.5.0/2
               Changed Rule: PST8PDT7,M3.2.0/2,M11.1.0/2

               TZ Subregion: Mexico/BajaSur
               Existing Rule: MST7
               Changed Rule: MST7MDT6,M4.1.0/2,M10.5.0/2

               TZ Subregion: Mexico/General
               Existing Rule: CST6
               Changed Rule: CST6MDT5,M4.1.0/2,M10.5.0/2

               TZ Subregion: Cuba
               Existing Rule: CST5CDT4,M5.2.0/0,M10.2.0/0
               Changed Rule: CST5CDT4,M4.1.0/0,M10.5.0/1

               TZ Subregion: Jamaica
               Existing Rule: EST5EDT4,M4.1.0/2,M10.5.0/2
               Changed Rule: EST5

               TZ Subregion: Brazil/East
               Existing Rule: EST3EDT2,M10.2.0/2,M2.3.0/2
               Changed Rule: BRT3BTST2,M10.3.0/0,M2.3.0/0

               TZ Subregion: Brazil/West
               Existing Rule: WST4WDT3,M10.4.6/2,M2.2.6/2
               Changed Rule: AMT4

               TZ Subregion: Brazil/Acre
               Existing Rule: AST5ADT4,M10.4.6/2,M2.2.6/2
               Changed Rule: ACT5

               TZ Subregion: Brazil/DeNoronha
               Existing Rule: FST2FDT1,M10.4.6/2,M2.2.6/2
               Changed Rule: FNT2

               TZ Subregion: Chile/Continental
               Existing Rule: CST4CDT3,M10.2.0/0,M3.2.0/0
               Changed Rule: CLT4CLST3,M10.2.0/0,M3.2.0/0

               TZ Subregion: Chile/Easter Island
               Existing Rule: EST6EDT5,M10.2.0/0,M3.2.0/0
               Changed Rule: EAST6EASST5,M10.2.0/0,M3.2.0/0

               TZ Subregion: Egypt
               Existing Rule: EET-2EET_DST-3,J152/2,J305/2
               Changed Rule: EET-2EEST-3,M4.5.5/0,M9.5.4/24

               TZ Subregion: Libya
               Existing Rule: EET-2EET_DST-3,J121/2,J303/2
               Changed Rule: EET-2

               TZ Subregion: PRC
               Existing Rule: CST-8CDT-9,M4.2.0/2,M9.2.0/3
               Changed Rule: CST-8

               TZ Subregion: ROK
               Existing Rule: KST-9KDT-10,M5.2.0/2,M10.2.0/3
               Changed Rule: KST-9

               TZ Subregion: Israel
               Existing Rule: IST-2IDT-3,M4.3.0/2,M8.4.6/2
               Changed Rule: IST-2IDT-3,M3.5.5/2,M9.3.0/2

               TZ Subregion: Iran
               Existing Rule: IST-3:30IDT-4:30,M3.5.0/2,M9.3.0/2
               Changed Rule: IRST-3:30

               TZ Subregion: Singapore
               Existing Rule: SST-8
               Changed Rule: SGT-8

               TZ Subregion: Australia/YANCOWINNA
               Existing Rule: EST-9:30EST-10:30,M10.5.0/2,M3.5.0/3
               Changed Rule: CST-9:30CST-10:30,M10.5.0/2,M3.5.0/3

Hope this is useful!!!

Carter


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