I'm always getting these confused (silly humans) so here's a little cheat sheet
(watch for summer Daylight Savings Time):
EST (GMT - 5) = Eastern Standard Time from New York City to Indianapolis and Louisville and Tallahassee.
CST (GMT - 6) = Central Standard Time from Chicago, Nashville, Pensacola to Bismark, Pierre and Texas.
MST (GMT - 7) = Mountain Standard Time from Rapid City and New Mexico to Idaho, Utah and Arizona.
PST (GMT - 8 ) = Pacific Standard Time from Nevada and Lewiston to California.
AKST (GMT - 9) = Alaskan Standard Time.
HST (GMT - 10) = Hawaiian Standard Time (also includes the Aleutian Islands in Alaska, then it's referred to as HAST).
GMT = Greenwich Meridian Time for London, Morocco, and Portugal.
GMT + 1 for Spain and France to Sweden and Poland.
GMT + 2 for Finland, Turkey, Romania and Egypt.
GMT + 8 for Hong Kong and Philippines and Western Australia.
GMT + 9 for Japan.
GMT + 10 for Eastern Australia.
9pm EST = 8pm CST = 6pm PST = 2am next day GMT.
4am EST = 3am CST = 1am PST = 9am GMT.
(watch for summer Daylight Savings Time):
EST (GMT - 5) = Eastern Standard Time from New York City to Indianapolis and Louisville and Tallahassee.
CST (GMT - 6) = Central Standard Time from Chicago, Nashville, Pensacola to Bismark, Pierre and Texas.
MST (GMT - 7) = Mountain Standard Time from Rapid City and New Mexico to Idaho, Utah and Arizona.
PST (GMT - 8 ) = Pacific Standard Time from Nevada and Lewiston to California.
AKST (GMT - 9) = Alaskan Standard Time.
HST (GMT - 10) = Hawaiian Standard Time (also includes the Aleutian Islands in Alaska, then it's referred to as HAST).
GMT = Greenwich Meridian Time for London, Morocco, and Portugal.
GMT + 1 for Spain and France to Sweden and Poland.
GMT + 2 for Finland, Turkey, Romania and Egypt.
GMT + 8 for Hong Kong and Philippines and Western Australia.
GMT + 9 for Japan.
GMT + 10 for Eastern Australia.
9pm EST = 8pm CST = 6pm PST = 2am next day GMT.
4am EST = 3am CST = 1am PST = 9am GMT.