Thanks for bringing up the exciting components, we’re happily using them in our products.
My next concern of this dhtmlxScheduler component is the DST support. Does it work well if one of the user is located in a DST enabled timezone?
Component can work in such mode, that data on server is stored as UTC, and while showing on client it will be converted to local timezone ( according to OS|browser ) settings. Which will include DST when necessary ( component relays on system based time conversion, which is normally DST aware )