GMT (Greenwich Mean Time) and BST (British Summer Time).
Greenwich is a district in south-east London, England, on the south bank of the River Thames in the London Borough of Greenwich. It is best known for its maritime (ship-building and sailing) history and as giving its name to the Greenwich Meridian (0° longitude) and Greenwich Mean Time
Greenwich is located in the Royal Borough of Greenwich, which is a district of South East London, England. It is well known for its maritime history and for giving its name to the Greenwich Meridian and Greenwich Mean Time.
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.)
The prime meridian passes through Greenwich, England.
Greenwich is an observatory in London England, assigned as the "starting point" for the time zones.
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Pennsylvania is 5 hours behind Greenwich.
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.)