It's a good point. It would be nice to have some kind of "flexible" time listing like TBA. But, for now, the GM can write in the description: "Actual game time to-be-arranged". Or something like, "The time listed is only a suggestion, we may change depending on everyone's schedule, TBA". Hope this workaround helps in the meantime. However the downside is, you run into a lot of GM's saying "Time to be decided with everyone" then when everyone shows up, the GM says something like "Ok do you guys want to play on Sunday afternoon, or Tuesday afternoon, in Australian time zone?" (So games TBA are not actually available for any time under the sun; it's obviously going to be limited to times that would work for the GM, because if the time doesn't work for the GM, then the game will not happen. For this reason it is best if the GM or original-organizer can state the times that are possible, rather than just saying "any time" which usually isn't really true for most people).