When I changed the clock from winter to summertime on my SE k750i the calendar did not behave as expected. All events were moved one hour. I contacted Sony Ericsson Call Center about the problem and yesterday I got a response, this behavior is in the specification for the SE k750i. How stupid is that? I don’t care if they designed a bug on purpose or not. It causes problems for me, and I’d guess anyone else that uses the calendar on a k750i.
Update: After a few mails back and forth they’ve at least provided me with a workaround. Always sync the calendar with a computer and do a sync that overwrites the phone after each change between summer- and wintertime. Brilliant!