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How to Convert Time, Continued
Converting
GMT to ZT
When you convert GMT to ZT, you must apply the ZD to your ZT using
the opposite sign; plus (+) if in east longitude, minus (-) if in west
longitude.
Example 1: Assume that you are in longitude 156° 58'E, GMT is Olh
00m 00s on 01 July. You want to find ZT.
Step
Action
1.
Find your ZD. Divide 156° 58' by 15 and you get 10.
2.
Determine the sign of the correction. You are in east
longitude, so the sign is minus (-10).
3.
Apply the correction using the opposite
GMT
01h
00m
00s
ZD
+10
ZT
11h
00m
00s
Example 2: Assume that you are in longitude 145° 00' W and GMT is
16h 00m 00s on 30 December. You want to find ZT.
Step
Action
1.
Find your ZD. Divide 145° 00' by 15 and you get 10.
2.
Determine the sign of the correction. You are in west
longitude so the sign is plus (+10).
3.
Since you are going from GMT to ZT, apply the
correction using the opposite sign (-10).
GMT
ZT
16h
00m
00s
ZD
-10
06h
00m
00s
5-12
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