Sleep, work, play times
Set an activity for each hour in the day. It doesn't have to be very accurate because you'll see a general period of overlap.
12A
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
11A
12P
1P
2P
3P
4P
5P
6P
7P
8P
9P
10P
11P
When and where?
Pick a date, find as many time zones as you like.
Select locations and timezones...
Now find good times
Pick a column when most people are awake.