Orsha時間からKolkata時間への変換
09:16:37
+2.5
11:46:37
+7
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+2.5
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+2.5
+2.5
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+1.5
+1
+0.5
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-1
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-1
-1
-2
-2
-2
-2
-2
-2
-3
-6
-6
-6
-7
-7
-7
-8
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-10