You can compare the values saved into the databse for Event Start and Event End. You can also create a simple page where you use Sitefinity's API and show all events and the above mentioned values to see if there are some time differences. EventStart
and properties of the data item so you can put a breakpoint inside a method that binds the RadScheduler to see if there would be a difference.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items