Vagabundo

Hi ^^ I want to ask about something that I'm sure is very easy to do, but it seems I can't find the way to do it, I decide to post because I was like 2 hours looking for this with the search button but I can't fint it. My problem is that the reset for the big dungeons like icc, toc, so, naxx happens the sundays and I want to know if there is a way to change the day of that reset, because is kind of annoying for the players. So I want to change the day but no the duration of the reset, I still want to happend every 7 days but lets say on thursday. Thanks in advance