Donostia / San Sebastián時間からNew York City時間への変換
23:31:01
-6
17:31:01
+7
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+3
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+2.5
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+1.5
+1
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+0
+0
+0
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-1
-1
-1
-1
-1
-1
-2
-5
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-5
-6
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-9