Christiana時間からSeoul時間への変換
13:20:30
+7
20:20:30
+7
+7
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+7
+7
+6
+6
+6
+6
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+3
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+2
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-1
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-1
-1
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-2
-2
-5
-5
-5
-5
-6
-6
-7
-7
-8
-9