Greenwich Mean Time is a world standard consisting of 24 time zones starting at GMT 0 which, to give you an idea of the location, passes through Greenwich, England. GMT time zones decrease from GMT-1 to GMT-12 heading West. GMT time zones increase from GMT+1 to GMT+12 heading East.
The United States is used to the Eastern, Central, Mountain, and Pacific standard time zones which are GMT-5, GMT-6, GMT-7, and GMT-8, respectively. During the summer months, Eastern, Central, Mountain, and Pacific Daylight Savings time zones are GMT-4, GMT-5, GMT-6, GMT-7, respectively.
Start with Greenwich in the middle and go out from there.
| -12 | -11 | -10 | -9 | -8 | -7 | -6 | -5 | -4 | -3 | -2 | -1 | GMT 0 |
+1 | +2 | +3 | +4 | +5 | +6 | +7 | +8 | +9 | +10 | +11 | +12 |
| Zone | City or Area Zone Crosses | Daylight Savings Time |
| GMT-12 | Eniwetok | |
| GMT-11 | Samoa | |
| GMT-10 | Hawaii | |
| GMT-9 | Alaska | |
| GMT-8 | PST, Pacific US | GMT-7 PDT |
| GMT-7 | MST, Mountain US | GMT-6 MDT |
| GMT-6 | CST, Central US | GMT-5 CDT |
| GMT-5 | EST, Eastern US | GMT-4 EDT |
| GMT-4 | Atlantic, Canada | |
| GMT-3 | Brazilia, Buenos Aries | |
| GMT-2 | Mid-Atlantic | |
| GMT-1 | Cape Verdes | |
| GMT | Greenwich Mean Time, Greenwich | |
| GMT+1 | Berlin, Rome | |
| GMT+2 | Israel, Cairo | |
| GMT+3 | Moscow, Kuwait | |
| GMT+4 | Abu Dhabi, Muscat | |
| GMT+5 | Islamabad, Karachi | |
| GMT+6 | Almaty, Dhaka | |
| GMT+7 | Bangkok, Jakarta | |
| GMT+8 | Hong Kong, Beijing | |
| GMT+9 | Tokyo, Osaka | |
| GMT+10 | Sydney, Melbourne, Guam | |
| GMT+11 | Magadan, Soloman Is. | |
| GMT+12 | Fiji, Wellington, Auckland |
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