Sofia時間からKolkata時間への変換
16:59:45
+2.5
19:29:45
+7
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+1.5
+1
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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