Ostashkov時間からDhaka時間への変換
15:04:42
+3
18:04:42
+6
+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
-3
-3
-6
-6
-6
-6
-7
-8
-8
-8
-9
-11