Was this ever addressed or resolved? I believe I'm still seeing this behavior in new versions (Telerik.UI.for.AspNet.Core 2016.2.714) when setting an event in a different timezone than what the calendar is using for display.
For example:
1. Set the calendar's timezone to "America/Chicago", aka (GMT-0:600) Central Time (US & Canada)"
2. Create a new event and specify timezone "(GMT-0:800) Pacific Time (US & Canada)" for both start and end time. Save the new event.
3. Note that the event properly converts the time and displays the event in Central Time.
4. Edit the event. Note the timezone shows "America/Log_Angeles", but Start and End time reflect the time that is displayed on the calendar in Central Time.
5. Saving the event without adjusting the time applies the conversion from PT to CT again.