Jeddah時間からGaborone時間への変換
19:56:03
-1
18:56:03
+7
+7
+6
+6
+6
+6
+6
+5
+5
+5
+5
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+2
+2
+1.5
+1
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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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-10