I understand your reasoning quite well. I can see how the change to the calendar can be troublesome to Oceanic players.
I merely wished to clarify why your post was moved from CS.
Also, here was a post that Blizzard had made concerning why the calendar times were set to one universal time.
However, events start globally at the same time now and that is Pacific Time.
This is done because of the cross-realm capabilities. If you go from a realm where the event is started to a realm where the event has not started then you could lose event related items. So they all start at the same time to avoid that problem
https://us.battle.net/forums/en/wow/topic/20769667734#post-8