New TZ Rules for Daylight Savings Time
John Wade
jwade at oakton.edu
Tue Feb 13 16:39:49 EST 2007
If you do a
zdump -v America/Chicago
In Linux, you will see that Linux keeps the timezone DST info per
year. Most modern OS's do as does java 1.4 and later.
Hope this helps,
John Wade
Carter Bullard wrote:
> 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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