Montana時間からMexico City時間への変換
08:16:00
-9
23:16:00
+7
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+6
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+5
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+1
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-1
-1
-1
-1
-2
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-2
-2
-2
-2
-3
-6
-6
-6
-7
-7
-7
-8
-8
-9
-10