Unfortunately, RadScheduler has no integrated support for DST. We have considered such support, but it is very complicated to implement. There are constant changes to the rules for the specific time zones and this information should be kept up-to-date. We are talking about 390 time zones here. We have decided that this is well outside the scope of RadScheduler and the developer should decide how to implement it. The chances are that he/she will only have to work with a limited number of time zones and the solution will not be that complex. The .NET framework itself provides basic information for the current time zone on the server.
If you need detailed information about DST in different time zones you can use a time zone library. For example, the PublicDomain library
at CodePlex offers up-to-date and complete information about time zones. With this information you can alter the appointments on-the-fly.
the Telerik team