I'm in England, which is currently GMT+1. It goes back to GMT some Sunday this month, but I forget which. If it's early enough to affect the game, all of the times I list go forward an hour.
All times in GMT:
I'm currently sleeping roughly 10pm through 6am. In addition I'm busy on Sundays from 2pm through to about 7pm, Mondays from 6pm through 10pm (I'll try and show up before going to sleep then, though), Thursdays from 5pm through 9:30pm, and Saturdays from 1pm through till at least 5pm, but probably much later. Notably I'm unimpeded during large chunks of the day.
I suspect that you're not going to be able to cater for everyone no matter how you slice it, but if you brought it forward a few hours I could be around for them on most days (I'm still in the house on Monday evenings, so I'd poke my head in if it made the difference at a deadline). This would probably screw with any PST people (are there any? I just don't know), so hey.