It's been kindly pointed out that I've made a complete schoolboy's on the times in the OP.
Of course:-
8-11 a.m. British Summer Time
9-12 a.m. Central European Time
3-6 p.m. Eastern Standard Time
2-5 p.m. Central Standard Time
1-4 p.m Mountain Standard Time
Midnight-3 a.m. Pacific Standard Time
I apologise for any misunderstanding.