Sedan時間からNew York City時間への変換
12:40:30
-6
06:40:30
+7
+7
+7
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+6
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+6
+6
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+3
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+2
+1.5
+1
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-1
-1
-1
-1
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-1
-2
-5
-5
-5
-6
-6
-6
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-7
-8
-9