Some questions about the database format

[Lee Baker]

There is also a c# API implementation at
http://www.codeproject.com/KB/locale/zoneinfo_dotnet_api.aspx

Cheers

Lee

--------
Those who sacrifice liberty for security deserve neither
-- Benjamin Franklin


On 29 June 2010 15:11, <yoshito_umaoka at us.ibm.com> wrote:

> Yves Goergen <nospam.list at unclassified.de> wrote on 06/29/2010 09:27:01
> AM:
>
> > Hi,
> >
> > I intend to use the tz database in my C# calendar application. Since I
> > need a decent time zone support, I was pointed to this database from the
> > MSDN forums. I now have a few questions regarding the file format of the
> > text files.
> >
> > A day specification of "Sun>=1" or "Sun>=8" should be clear, I interpret
> > this as the first/second Sunday in a month. But what weekday and week is
> > "Sun>=25" or "Sun>=2"?
> >
> > How is the Zone field "[UNTIL]" to be understood exactly? Is it
> including
> > or excluding the given time? What does "1990" mean, is it until and
> > inclusive the whole year 1990, ie /1990-12-31T23:59:59 or is it
> something
> > around 1990-01-01?
> >
> > What does the time specification "2:00s" mean? I've seen it several
> times
> > but couldn't make any sense of it.
>
> These are well defined in the man page of zic.
> Download tzcodeC.tar.gz (C is a version such as 2010j) from
> ftp://elsie.nci.nih.gov/pub/ and read docs included in the distribution.
>
> >
> > Are all rules in the text files sorted ascending by time ("FROM" year)?
> > That would simplify the processing because in order to convert them into
> > .NET framework structures I need pairs of DST start and end rules
> together
> > for a range of years, and thus need to resolve the overlapping rule
> > definitions.
> >
>
> Strictly speaking, you cannot expect DST start and end are always paired
> within a single year. Also, some rules used by the tzdatabasemight not be
> directly mapped to Windows/.NET style rule. I'm working for ICU project (
> http://icu-project.org/) and implemented a time zone API which extracts
> DST start/end rules around the given time in Windows/iCalendar style rule
> format:
>
> C++
>
> http://icu-project.org/apiref/icu4c/classBasicTimeZone.html#8ec554fc7301450deeb584a782469f54
> Java
>
> http://www.icu-project.org/apiref/icu4j/com/ibm/icu/util/BasicTimeZone.html#getSimpleTimeZoneRulesNear%28long%29
>
> -Yoshito
>
>
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