I've got something for you to try out:

exiftool-7.38.zip

This is the same as version 7.37, but bundled with Perl 5.10.0 instead of Perl 5.8.7. I'm not 100% happy with this for two reasons:

1) Modules that should be included automatically in the package aren't, so I have to load them explicitly at run time which increases the time needed to launch exiftool by a small bit. (I hope to figure out a way around this.)

2) The new perl is bigger, so the zip file is about 2.4 MB now instead of 1.9 MB. But I knew this would happen and there is no way around it.

However, it does seem to fix the DST problem in my tests.

- Phil