[itsm] Strange time zone issues..

I have really messed around with the calendars to much yet. I set the basic time zone information and left it at that. I plan to play around with them in a little more detail later on in life. I setup a metting and clearly selected the time as 11:00AM start and 11:30AM stop. When I got the notification on my black berry, it was all wrong. It is 100% correct on my P.C. though? Any ideas? Thanks, Joshua