East London 시간을 Ponca City 시간으로 변환
15:18:10
-7
08:18:10
+7
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+4.5
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+3.5
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+3
+3
+2.5
+2
+1.5
+1
+1
+1
+1
+1
+1
+1
+1
+1
+0
+0
+0
+0
-1
-1
-1
-1
-1
-1
-2
-5
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-6
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-9