Senta時間からMexico City時間への変換
22:00:15
-8
14:00:15
+7
+7
+7
+7
+7
+6
+6
+6
+6
+6
+6
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+1
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-1
-1
-1
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-2
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-5
-5
-5
-5
-6
-6
-7
-7
-8
-9