East London時間からMendip時間への変換
11:22:30
-1
10:22:30
+7
+7
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+3.5
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+3.5
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+3.5
+3
+3
+2.5
+2
+1.5
+1
+1
+1
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+1
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+0
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-1
-1
-1
-1
-1
-1
-2
-5
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-9