My unit tests for non-local timezones are breaking when I upgrade from 2.4.8 to 2.5.1.
There is a comment (posted 2013-01-27 by fs5) on issue 304 that has a fix to TimestampDataType for this.
https://sourceforge.net/p/dbunit/bugs/304/
I overrode TimestampDataType with the fix from that comment and it worked.
here is a link to the comment on issue 304 that I referred to: https://sourceforge.net/p/dbunit/bugs/304/#74a5
Thanks for reporting and finding the patch fix.