I have enabled time zone support in Apple Calendar to facilitate planning video chats with people abroad. It means I can plan appointments according to JST, while I am in CEST. For example, I'd put the meeting in Apple Calendar for 17:30 JST, but it'd show up for me at 10:30 CEST. The problem is that Ellie doesn't do this; these appointments show up in Ellie according to the time they were originally put in Apple Calendar for, regardless of the time zone I attached to it.