Riyadh時間からChangping時間への変換
15:40:15
+5
20:40:15
+6
+6
+6
+6
+6
+5
+5
+5
+5
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+2
+2
+1.5
+1
+0.5
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-1
-1
-1
-1
-2
-2
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-2
-2
-2
-3
-3
-3
-6
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-11