If you don't do anything, the daily reset is at 4:00 GMT+1
Weekly reset for raid instances it Monday 4:00 GMT+1
Reset for weekly quests, and currency things like astral etc is Thursday 4:00 GMT+1
That's a little bit confusing.
It would be better to say that reset happens at 0300GMT(UTC) or 0400CET(Server time zone). GMT(UTC)+1=CET.
However, I think everyone's clients gives event times in local time (where they are in the world), so no one should have to think too hard about this once we get comfortable with the game.
Cheers!