January 2007 - tz - lists.iana.org

Canada DST Rules for 2007
by Johan Lindfors Jan. 10, 2007

Jan. 10, 2007

Hi, I'm verifying Canada DST in 2007 Rules and there seems to be conflict with documentation in these pages and in the source page. (Also I may be the conflict ;-)) But please could you verify this: These two pages: http://home.tiscali.nl/~t876506/TZworld.html#nam http://home.tiscali.nl/~t876506/Multizones.html#ca Versus source pages: http://inms-ienm.nrc-cnrc.gc.ca/time_services/daylight_saving_e.html http://inms-ienm.nrc-cnrc.gc.ca/faq_time_e.html#5 Possible conflicts: 1. Can not found explanation from source page why DST should end Last Sun of October in following Cities instead of First Sunday in November(Canada)? Canada >=2007 on Mar Sun>=8 2:00 1:00 Canada >=2007 off Nov Sun>=1 2:00 0 Winn on Apr Sun>=1 2:00 1:00 Winn off Oct lastSun 2:00s 0 Edm on Apr Sun>=1 2:00 1:00 Edm off Oct lastSun 2:00 0 Vanc on Apr Sun>=1 2:00 1:00 Vanc off Oct lastSun 2:00 0 NT_YK on Apr Sun>=1 2:00 1:00 NT_YK off Oct lastSun 2:00 0 2. In the source page there are defined that Manitoba that is same as Winnipeg DST ends 3:00 instead of 2:00. Winn on Apr Sun>=1 2:00 1:00 Winn off Oct lastSun 2:00s 0 Br Johan Lindfors

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Re: FW: suggestion for simplified represention of timezone rules
by Paul Eggert Jan. 9, 2007

Jan. 9, 2007

Robert Hodge <roberth(a)sisconet.com> writes: > It's not a source code issue. I have been able to compile it on windows. > The problem is that the resultant files don't work correctly. They > don't reflect the rules that are defined in the zoneinfo source files. In what sense do the files not work, exactly? For example, does your zic's output match the output generated by zic on GNU/Linux or Unix machines? If so, then the problem is not with the way you built zic; it lies somewhere else. If not, then exactly how does the output differ? > It appears that the existing zoneinfo 'compilers' are misinterpreting > the text data and are building binary zone files incorrectly. zic should be quite reliable on GNU/Linux and Unix platforms, as its output is used in a lot of places. Occasionally we get bug reports, and we do fix any specific bugs that are reported. It is certainly quite possible that there is a portability bug when zic is run on non-POSIXish platforms. However, your report did not contain enough details for us to know what the bug is, or how to reproduce it.

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suggestion for simplified represention of timezone rules
by Robert Hodge Jan. 8, 2007

Jan. 8, 2007

Hello, I have been doing extensive work with the tz database, and while the data is quite useful, it is not in the most accessible format. I have had little success using the zic compiler or any of the source code, and have been forced to do my own parsing and analysis of the data. One aspect of the representation of rules I find awkward is the notation for the day on which a rule takes effect. There are rules such as "lastSun" or "Sun>=8", etc. While descriptive, they are are hard to process. I would like to suggest a better approach. It takes the form "d op nn", where 'd' is the day-of-week, 0=Sun to 6=Sat 'op' is a comparison code of '<', '=' or '>', and 'nn' is a 2-digit day number (may be 00 or 32) The comparision code works as follows: '=' nn is an exact value '<' rule describes the last day less than nn '>' rule describes the first day greater than nn Examples: 0>07 first Sun > 7 (same as first Sun >= 8) 0<32 last Sun < 32 (same as "lastSun") 0=27 Sun the 27th of the month When a range of years are involved in a rule, there is no exact day-of-week, and in such cases, '9' may be used as a place-holder: 9=01 the first day of the month, regardless of what day-of-week it is There is little need to use a day-of-week with >, since the value would always be the same. Example: 9>07 means: first day of the month (regardless of day of week) that is > 7 is always 8. It is conceivable that 9<nn could be used, but the only case where it would have any merit is in February: 9<32 last day of the month For months other than Feb, the value is a constant for a given month, and for Feb it depends on the leap-year status. Since no one (that I know of) does anthing about DST in Feb, we can safely eliminate the 9<nn form as well as the 9>nn form. The conversion from existing rules to this format is pretty straightforward: lastSun 0<32 '32' is constant for 'last' Sun>=8 0>07 subtract 1 from the tz rule value Sun<=21 0<22 add 1 to the tz rule value May 1 9=01 for May 1 of any year May 1 1980 4=01 May 1 1980 is a Thursday Hope you find this interesting. Regards, Robert Hodge

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Tzcode2007a.tar.gz and tzdata2007a.tar.gz
by Olson, Arthur David (NIH/NCI) [E] Jan. 8, 2007

Jan. 8, 2007

The files... ftp://elsie.nci.nih.gov/pub/tzcode2007a.tar.gz ...and... ftp://elsie.nci.nih.gov/pub/tzdata2007a.tar.gz ...are now available. These reflect the changes circulated last week on the time zone mailing list by Paul Eggert (as well as Derick Rethan's Asmara change and Oscar van Vlijmen's Easter Island local mean time change). These also reflect the symbolic link changes circulated in December. --ado

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Added info for US 2007 DST change?
by kevin＠ir.iit.edu Jan. 5, 2007

Jan. 5, 2007

Hi, I recently downloaded and compiled the latest zoneinfo db files. After doing a zdump -v on CST6CDT and EST5EDT it appears that they are still showing the old DST changes, however if I check the america file in the source it appears to have the correct info. Could I just be compiling it wrong or am I missing something here. Thank You, Kevin

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Archive with all recent tzdata releases? -- WAS: Version control? Changelog? ...
by Bryan J. Smith Jan. 5, 2007

Jan. 5, 2007

"Bryan J. Smith" <b.j.smith(a)ieee.org> wrote: > BTW, I did note this post: > http://article.gmane.org/gmane.comp.time.tz/1339 > Unfortunately the svn repository doesn't list changes. I'm used to > running "svn+trac" myself, which does a good, basic job of showing > version-to-version changes. Unfortunately I don't run a public > server myself anymore (just not enough time). Aw screw that, I'll just generate the Trac pages and then save them as a set of static HTML pages (in a tarball). As such, does anyone have an archive with all recent tzdata releases? I noted the PlanetMirror FTP site, but it only goes back to 2006b: ftp://ftp.planetmirror.com/pub/timezone/ I'd like to go further back, at least to early 2005, if not 2004. -- Bryan J. Smith Professional, Technical Annoyance b.j.smith(a)ieee.org http://thebs413.blogspot.com -------------------------------------------------- Fission Power: An Inconvenient Solution

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Version control? Changelog? Good list of regions/paths aligning with US DST changes?
by Bryan J. Smith Jan. 4, 2007

Jan. 4, 2007

I know this is a tall order. Not looking for anyone to fill it either. I can do my own research, so pointers are always recommended. If I've overlooked this info on the TZ page, my apologies, just [re]point me to it. - Is there a version control repository for zoneinfo? - Or a changelog of any corrections/additions? More to the point, I'm looking for a good list of any regions/zoneinfo paths that are aligning their changes with the US DST changes. I noted several were announced in 2006. I hope I'm not the only schmuck out there trying to track this. I'm hoping someone else has such a list, a blog, etc... If not, I might blog myself, even if it's just a tiny subset and focuses only on the US changes (and ripples from it) going into effect for 2007. Even longer story short, I'm tracking a number of embedded solutions and their tzdata (or lackthereof) updates. Just looking for a good authority on any and all tzdata changes since the 2005 legislation for the 2007 change. E.g., Red Hat has several errata for its tzdata package: - RHEA-2005:655-7: USA, Australia, Haiti, Nicaragua ... - RHEA-2006:0213-7: join US DST change, Canada, Indiana/USA ... - RHEA-2006:0277-7: Sri Lanka - RHEA-2006:0745-3: Western Australia DST But embedded developers like Montavista** only released 1 change (possibly not addressing Canada, etc...): - Fix 15446 (2005Nov): NA timezone file to include the latest DST Ultimately I'm trying to come up with a test plan to verify updates for all major financial/trading regions where our equipment runs. I think I can safely ignore the Indiana changes, etc..., and stick with major regions. -- Bryan J. Smith Professional, Technical Annoyance b.j.smith(a)ieee.org http://thebs413.blogspot.com -------------------------------------------------- Fission Power: An Inconvenient Solution

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Re: Version control? Changelog? Good list of regions/paths aligning with US DST changes?
by Bryan J. Smith Jan. 4, 2007

Jan. 4, 2007

"Bryan J. Smith" <b.j.smith(a)ieee.org> wrote: > I know this is a tall order. Not looking for anyone to fill it > either. I can do my own research, so pointers are always > recommended. If I've overlooked this info on the TZ page, my > apologies, just [re]point me to it. > - Is there a version control repository for zoneinfo? > - Or a changelog of any corrections/additions? BTW, I did note this post: http://article.gmane.org/gmane.comp.time.tz/1339 Unfortunately the svn repository doesn't list changes. I'm used to running "svn+trac" myself, which does a good, basic job of showing version-to-version changes. Unfortunately I don't run a public server myself anymore (just not enough time). Thanx again for any assistance, links or pointers anyone can provide! -- Bryan J. Smith Professional, Technical Annoyance b.j.smith(a)ieee.org http://thebs413.blogspot.com -------------------------------------------------- Fission Power: An Inconvenient Solution

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RE: Istanbul,Turkey needs time zone rule update
by Olson, Arthur David (NIH/NCI) [E] Jan. 3, 2007

Jan. 3, 2007

I'm forwarding this message from Amar Devegowda, who is not on the time zone mailing list. Those of you who are on the time zone mailing list should direct replies appropriately. --ado ________________________________ From: Amar Devegowda [mailto:ADEVEGOW@in.ibm.com] Sent: Wednesday, January 03, 2007 1:15 PM To: Olson, Arthur David (NIH/NCI) [E] Subject: Istanbul,Turkey needs time zone rule update Hi, This is Amar Devegowda from IBM India Software Labs. I sent this mail to tz(a)lecserver.nci.nih.gov couple of times and got bounced and now I am sending it directly to you. I downloaded the tzdata2006p.tar.gz and found that the time zone rules for Istanbul, Turkey (File name: europe in tzdata2006p.tar.gz) are outdated. The time zone rules for Istanbul, Turkey have not been changed for years now. It seems like that it was last updated in year 1985 or so. The latest rules are available at - http://www.timeanddate.com/worldclock/timezone.html?n=107 We have customers reporting problems to us stating that our Java has got outdated time zone rules for Istanbul, Turkey. Hence, could you please update the time zone database with the new rules for Istanbul, Turkey ? Thanks in advance. Regards, Amar Amar Devegowda Java L3 Support for Windows, Java Technology Center, IBM India Software Labs, Bangalore, India Telephone 91-80-25094423

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Re: proposed tz changes for Bahamas, Eucla, Eritrea, Faroe
by Paul Eggert Jan. 3, 2007

Jan. 3, 2007

"Dave O'Callaghan" <daveoc(a)uk.ibm.com> writes: > For example, because of lack of time (we couldn't wait) we took the > W.Australia patch and applied it to tzdata2006n (calling the new version > tzdata2006o (we hadn't previously shipped your 'o' version). Then we had > customers asking for the 'p' version thinking that is what they needed for > W. Australia. In the future I suggest that you append a prefix (e.g., tzdata2006n-ibm1) rather than guessing what the next official data will look like. > Many thanks to you both for your time and attention to this (it seems to > be a never ending journey) There are four things sure in life: death, taxes, politics, and time zone rule changes.

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