Genet時間からKolkata時間への変換
15:00:37
+2.5
17:30:37
+7
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+1.5
+1
+0.5
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-1
-1
-1
-1
-2
-2
-2
-2
-2
-2
-3
-6
-6
-6
-7
-7
-7
-8
-8
-9
-10