Margate時間からSeoul時間への変換
+7
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+4
+3.5
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+3.5
+3.5
+3
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+2.5
+2
+1.5
+1
+1
+1
+1
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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