East London時間からNottingham時間への変換
13:51:30
-2
11:51:30
+7
+7
+7
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+7
+6
+6
+6
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+2
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+1
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-1
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-1
-1
-1
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-2
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-5
-5
-5
-5
-6
-7
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-7
-8
-10