Los Angeles, California is UTC/GMT-8. From the second Sunday in March until the first Sunday in November, Los Angeles observes daylight savings and moves into UTC/GMT-7.
While in daylight savings, Los Angeles is seven hours behind GMT. Outside of daylight savings, it is eight hours behind.
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Japan is (Greenwich Mean Time) GMT +9 hours, ie. 9 hours ahead of Greenwich, England. Los Angeles is (Greenwich Mean Time) GMT -6 hours, ie. 6 hours behind Greenwich, England. Japan is 15 hours ahead of Los Angeles. (Daylight savings not taken into account.)
England (London) is at (Greenwich Mean Time) GMT. US Pacific Time is (Greenwich Mean Time) GMT -8 hours, ie. 8 hours behind Greenwich, England. Los Angeles is 8 hours behind GMT. (Daylight savings not taken into account.)
Sydney is (Greenwich Mean Time) GMT +10 hours, ie. 10 hours ahead of Greenwich, England. California is (Greenwich Mean Time) GMT -8 hours, ie. 8 hours behind Greenwich, England. Los Angeles is 18 hours behind Sydney. (Daylight savings not taken into account.)
Moscow is (Greenwich Mean Time) GMT +3 hours, ie. 3 hours ahead of Greenwich, England. Tanzania is (Greenwich Mean Time) GMT +3 hours, ie. 3 hours ahead of Greenwich, England. There is no time difference. (Daylight savings not taken into account.)
Holland is (Greenwich Mean Time) GMT +1 hour, ie. 1 hour ahead of Greenwich, England. Italy is (Greenwich Mean Time) GMT +1 hour, ie. 1 hour ahead of Greenwich, England. There is no time difference between Amsterdam and Rome. (Daylight savings not taken into account.)
California is in the GMT - 8 timezone. This means that the time difference between Greenwich Mean Time can be found by subtracting 8 hours. Therefore, if it's 11 am on Feb 24th in Greenwich, then it will be 3am on Feb 24th in Los Angeles. When daylight savings time starts (which varies from year to year) California's time difference ends up being -7 rather than -8. So, on July 2nd at 4:45pm in Greenwich, the time in L.A. will be 9:45am, July 2nd.
Australian Eastern Standard Time is ten hours ahead of Greenwich Mean Time. Australian Eastern Summer Time is eleven hours ahead of Greenwich Mean Time.
Belfast is at (Greenwich Mean Time) GMT. San Diego is (Greenwich Mean Time) GMT -8 hours, ie. 8 hours behind Greenwich, England. San Diego is 8 hours behind Belfast. (Daylight savings not taken into account.)
England is at (Greenwich Mean Time) GMT. Munich is (Greenwich Mean Time) GMT +1 hour, ie. 1 hour ahead of Greenwich, England. England is 1 hour behind Munich. (Daylight savings not taken into account.)
London, England is at (Greenwich Mean Time) GMT. Perth, Australia is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England.
Glasgow is one hour ahead of Greenwich Mean Time from the last Sun. of Mar. until the last Sun. of Oct. Glasgow is on GMT the rest of the year. If you mean Greenwich in NYC, Glasgow is usually five hours ahead.