Moscow時間からMont-Royal時間への変換
17:56:20
-7
10:56:20
+7
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+6
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+5
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+2
+2
+1.5
+1
+0.5
+0
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+0
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-1
-1
-1
-1
-2
-2
-2
-2
-2
-2
-3
-6
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-7
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-10