Hi, On Wednesday 01 February 2012 01:59:49 Stephen Kelly wrote: > On Tuesday, January 31, 2012 22:50:51 you wrote: > > * I'd prefer if we don't have to ship the database. As noted it can > > change easily > > and a compiled in database would get out of sync.
Look for the system database - on systems that are based on Olson DB it's
always on very few specific locations. For the others ship a backup resource
file or plugin.
> > * ICU has timezone support as well. Something that could simplify our
> > life?
>
> Wouldn't that be out of sync too? What is the ICU timezone support?
ICU ships a copy of the Olson DB.
> > * Do we need to support both the Windows and Unix format, or could we get
> > away with Unix only in a first version (if e.g. ICU provides the data)?
>
> I think this is 5.x material anyway. I think it would need somewhat more
> involved discussion.
Windows names can be mapped to Olson names - there are lists on the web. The
calculation results are almost identical. Almost.
A parser for Olson DB files is not overly complex to write - I did that within
a weekend.
git://silmor.de/konrad/tzone.git
I haven't completely checked Stephen's interface, but I had the distinct
feeling that it underestimates the complexity of time zones:
*the definition of standard time and/or DST can change for any time zone at any
time
*there can be 1 or up to 3 different time specs in a year (under exceptional
circumstances even more)
*it is not always clear which time spec is standard and which one is DST
Konrad
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