I think the time for the reset of Yobit signature campaign is 18:00 or 19:00 UTC ( UTC is the time zone on which bitcointalk.org is working )
Yes I am pretty sure this is the time for reset.. I noticed my posts start counting for the next day around this time
I think their time zone is fixed 18:00 UTC , my brother is at there and he often try to complete the posts of the day before that time , but one day he told me that after their time reset he when started to post it was counted in the previous day, I told him that no they have their fixed time and persuade him but on that day one of my friend also told me the same. Now I think they are to and fro from that time.