Mbala時間からNew York City時間への変換
20:53:06
-6
14:53:06
+7
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+4.5
+4
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+3.5
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+3
+3
+2.5
+2
+1.5
+1
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+1
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+0
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-1
-1
-1
-1
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-2
-5
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