What is the timezone for the count ?
Some people said it's GMT+3 (Moscow time).
The forum, by default, uses GMT+0; So if that's what is set for you, the next day is set at 21:00.
I talked to other users and it is not exactly GMT +3, because for some already around 19:00 forum time, counts posts for the next day. It probably depends individually for each user. It is possible that it depends on time each of us registered.
just like what tryninja and posi said yobit time is based on GMT+3 but if you are still having doubts try following this conversation onwards
they talked about how yobit's 3-4 hours time deadline before yobit counts the total post you made in that time they also talked about why some post being counted the next day and what timezone yobit uses. you might find the answer you're satisfied with on that conversation.