Gogrial時間からIbadan時間への変換
23:01:30
-1
22:01:30
+7
+7
+7
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+6
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+4
+4
+4
+4
+3.5
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+3.5
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+3.5
+3.5
+3.5
+3.5
+3.5
+3
+3
+2.5
+2
+1.5
+1
+1
+1
+1
+1
+1
+1
+1
+1
+0
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+0
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-1
-1
-1
-1
-1
-1
-2
-5
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-5
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-9