Weekly reset question

when does my weekly trophys etc i earned for a guild get reset? back to zero because my ranking changed today 4pm bst from 1 to 15.

Guild Trophy and Gold Contribution will reset 24 before everything else

Not for everyone. Mine has been stable for the last couple weeks (exactly as you describe), but not everyone in my guild resets at the same time. Also, prior to the last couple weeks, I was getting multiple resets every week, or sometimes not resetting for two weeks at a time.