Depending on where you are living this may occur on Tuesday of Wednesday. The sun reaches it northern most point on:
Wednesday, June 21, 12:24 A.M. EDT
Tuesday, June 20, 11:24 P.M. CDT
Tuesday, June 20, 10:24 P.M. MDT
Tuesday, June 20, 9:24 P.M. PDT
of course in Britain (Greenwich mean) that is 5 hrs. ahead of EDT and 8 hrs. ahead of me. The sun doesn't care what time it is.
So just decide which day and time you want to embrace, rip 'em off and take off!
Duane