Pennsylvania is 5 hours behind Greenwich.
The USA has 6 Time Zones including Alaska and Hawaii. Eastern Time - is (Greenwich Mean Time) GMT -5 hours, ie. 5 hours behind Greenwich, England. Central Time - is (Greenwich Mean Time) GMT -6 hours, ie. 6 hours behind Greenwich, England. Mountain Time - is (Greenwich Mean Time) GMT -7 hours, ie. 7 hours behind Greenwich, England. Pacific Time - is (Greenwich Mean Time) GMT -8 hours, ie. 8 hours behind Greenwich, England. Alaska Time - is (Greenwich Mean Time) GMT -9 hours, ie. 9 hours behind Greenwich, England. Hawaii Time - is (Greenwich Mean Time) GMT -10 hours, ie. 10 hours behind Greenwich, England.
England (London) is at (Greenwich Mean Time) GMT. All of China is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England. (Daylight savings not taken into account.)
Greenwich is an observatory in London England, assigned as the "starting point" for the time zones.
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England is at (Greenwich Mean Time) GMT. US Eastern Time - is (Greenwich Mean Time) GMT -5 hours, ie. 5 hours behind Greenwich, England. Orlando is 5 hours behind England. (Daylight savings not taken into account.)
England is at (Greenwich Mean Time) GMT. New Zealand is (Greenwich Mean Time) GMT +12 hours, ie. 12 hours ahead of Greenwich, England. England is 12 hours behind New Zealand. (Daylight savings not taken into account.)
Australia has 3 Time Zones. Eastern is (Greenwich Mean Time) GMT +10 hours, ie. 10 hours ahead of Greenwich, England. Central is (Greenwich Mean Time) GMT +9.5 hours, ie. 9.5 hours ahead of Greenwich, England. Western is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England. Quito is (Greenwich Mean Time) GMT -5 hours, ie. 5 hours behind Greenwich, England. Quito is 13 to 15 hours behind Australia. (Daylight savings not taken into account.)
Germany is (Greenwich Mean Time) GMT +1 hour, ie. 1 hour ahead of Greenwich, England. Australia has 3 Time Zones. Eastern is (Greenwich Mean Time) GMT +10 hours, ie. 10 hours ahead of Greenwich, England. Central is (Greenwich Mean Time) GMT +9.5 hours, ie. 9.5 hours ahead of Greenwich, England. Western is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England. Germany is 8-10 hours behind Australia. (Daylight savings not taken into account.)
Greenwich England
GMT (Greenwich Mean Time) and BST (British Summer Time).
GMT stands for Greenwich Mean Time. It is named after Greenwich England.
At the Royal Observatory in Greenwich, England, which is located on the Prime Meridian.