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| Table B.1 Zone central boundary displacement. | | Zone Number | Central
meridian | Boundary
meridian | Boundary
meridian | Displacement
from GMT
(hours) | | 180° 00' E | 172° 30' E | 172° 30' W | | | 165° 00' E | 157° 30' E | 172° 30' E | | | 150° 00' E | 142° 30' E | 157° 30' E | | | 135° 00' E | 127° 30' E | 142° 30' E | | | 120° 00' E | 112° 30' E | 127° 30' E | | | 105° 00' E | 97° 30' E | 112° 30' E | | | 90° 00' E | 82° 30' E | 97° 30' E | | | 75° 00' E | 67° 30' E | 82° 30' E | | | 60° 00' E | 52° 30' E | 67° 30' E | | | 45° 00' E | 37° 30' E | 52° 30' E | | | 30° 00' E | 22° 30' E | 37° 30' E | | | 15° 00' E | 7° 30' E | 22° 30' E | | | 0° 00' W | 7° 30' E | 7° 30' W | | | 15° 00' W | 7° 30' W | 22° 30' W | | | 30° 00' W | 22° 30' W | 37° 30' W | | | 45° 00' W | 37° 30' W | 52° 30' W | | | 60° 00' W | 52° 30' W | 67° 30' W | | | 75° 00' W | 67° 30' W | 82° 30' W | | | 90° 00' W | 82° 30' W | 97° 30' W | | | 105° 00' W | 97° 30' W | 112° 30' W | | | 120° 00' W | 112° 30' W | 127° 30' W | | | 135° 00' W | 127° 30' W | 142° 30' W | | | 150° 00' W | 142° 30' W | 157° 30' W | | | 165° 00' W | 157° 30' W | 172° 30' W | | | 180° 00' W | 172° 30' W | 172° 30' E | |  |
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Note that zones +12 and 12 are the same, defining the International Date Line. |
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The 24 zones were originally labeled with letters A through Y (skipping J) with Z reserved for GMT. |
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