THIS IS ONLY A DEMO.
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00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 11:00 12:00 13:00 ... UTC (click)
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Choose any number of players. Then refresh. 






The last availability line shows
 when the players shown can meet.

White is available
Black is unavailable
Other color is "not sure"

The group availability is computed as follows:
-- if all are available at a particular time slot then group is available
-- if anyone is not available at a particular time slot then group is not available
-- otherwise it's true that at least one is unsure and all that are sure are available: the group is "unsure"