I could help you guys!
180 degrees west = 12 hrs less than Grenwich time
165 degrees west = 11 hrs less
150 dgs west = 10 hrs less
135 dgs west = 9 hrs less
120 dgs west = 8 hs less
105 dgs west = 7 hrs less
90 dgs west = 6 hrs less
75 dgs west = 5 hrs less
60 dgs west = 4 hrs less
45 dgs west = 3 hrs less
30 dgs west = 2 hrs less
15 dgs west = 1 hrs less
0 dgs = Grenwich time (0)
180 degrees west = 12 hrs morethan Grenwich time
165 degrees west = 11 hrs more
150 dgs east = 10 hrs more
135 dgs east = 9 hrs more
120 dgs east = 8 hs more
105 dgs east = 7 hrs more
90 dgs east = 6 hrs more
75 dgs east = 5 hrs more
60 dgs east = 4 hrs more
45 dgs east = 3 hrs more
30 dgs east = 2 hrs more
15 dgs east = 1 hr more
So, you get the Grenwich time (england) and use that key to figure out what time on what day to be online.
For example, 9am Christmas Day in Grenwich would be 7pm 26th December where I live (150 dgs east)
Its simple.