Letňany時間からNew York City時間への変換
23:30:25
-6
17:30:25
+7
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+4.5
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+3.5
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+3
+3
+2.5
+2
+1.5
+1
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+1
+0
+0
+0
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-1
-1
-1
-1
-1
-1
-2
-5
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-5
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