http://bugs.winehq.org/show_bug.cgi?id=12086
--- Comment #17 from Rob Shearman rob@codeweavers.com 2008-03-19 06:02:35 --- As Dmitry said, I used a tool to automatically generate the data and it was the resulting patch that caused this. Now the strange thing is that PST is generated correctly now (presumably after switching to daylight time) so that suggests there is a bug in the program.
However, there does seem to be inconsistencies with Windows in some of the other timezones in my patch. I'm not sure whether that is because of incorrect time zone data on my machine or a bug in the tool.