Countries to the West of England (America etc.) are behind Greenwich Mean Time and Countries to the East are ahead. An example is France is approx. 1hr ahead of England time wise, and America is 5hr behind.
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. All of China is in the same time zone, so China is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England. Depending on where in the USA you are, the difference is between 13 and 18 hours. (Daylight savings not taken into account.)
Three. The majority of Greenland is (Greenwich Mean Time) GMT -3 hours, ie. 3 hours behind Greenwich, England. The north western tip (two peninsulas) are (Greenwich Mean Time) GMT -4 hours, ie. 4 hours behind Greenwich, England. An island on the east coast is (Greenwich Mean Time) GMT -1 hours, ie. 1 hours behind Greenwich, England.
Japan is (Greenwich Mean Time) GMT +9 hours, ie. 9 hours ahead of Greenwich, England. Bangkok is (Greenwich Mean Time) GMT +7 hours, ie. 7 hours ahead of Greenwich, England. Bangkok is 2 hours behind Tokyo. (Neither Japan nor Thailand observes daylight saving time.)
England (London) is at (Greenwich Mean Time) GMT. Jakarta is (Greenwich Mean Time) GMT +7 hours, ie. 7 hours ahead of Greenwich, England. London is 7 hours behind Jakarta. (Daylight savings not taken into account.)
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. Finland is (Greenwich Mean Time) GMT +2 hours, ie. 2 hours ahead of Greenwich, England. Depending on where in the USA you are, the difference is between 7 and 12 hours. (Daylight savings not taken into account.)
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.
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.)
One. Iran is (Greenwich Mean Time) GMT +3.5 hours, ie. 3.5 hours ahead of Greenwich, England.
US Mountain Time - is (Greenwich Mean Time) GMT -7 hours, ie. 7 hours behind Greenwich, England. Nigeria is (Greenwich Mean Time) GMT +1 hours, ie. 1 hours ahead of Greenwich, England. US Mountain Time is 8 hours behind Nigeria. (Daylight savings not taken into account.)
You have not stated where you are coming from. Egypt is (Greenwich Mean Time) GMT +2 hours, ie. 2 hours ahead of Greenwich, England.
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. All of China is in the same time zone, so China is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England. Depending on where in the USA you are, the difference is between 13 and 18 hours. (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.)
Three. The majority of Greenland is (Greenwich Mean Time) GMT -3 hours, ie. 3 hours behind Greenwich, England. The north western tip (two peninsulas) are (Greenwich Mean Time) GMT -4 hours, ie. 4 hours behind Greenwich, England. An island on the east coast is (Greenwich Mean Time) GMT -1 hours, ie. 1 hours behind Greenwich, England.
Japan is (Greenwich Mean Time) GMT +9 hours, ie. 9 hours ahead of Greenwich, England. Bangkok is (Greenwich Mean Time) GMT +7 hours, ie. 7 hours ahead of Greenwich, England. Bangkok is 2 hours behind Tokyo. (Neither Japan nor Thailand observes daylight saving time.)
England (London) is at (Greenwich Mean Time) GMT. Jakarta is (Greenwich Mean Time) GMT +7 hours, ie. 7 hours ahead of Greenwich, England. London is 7 hours behind Jakarta. (Daylight savings not taken into account.)
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. Finland is (Greenwich Mean Time) GMT +2 hours, ie. 2 hours ahead of Greenwich, England. Depending on where in the USA you are, the difference is between 7 and 12 hours. (Daylight savings not taken into account.)
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. Singapore is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England. Depending on where in the USA you are, the difference is between 13 and 18 hours. (Daylight savings not taken into account.)