Riyadh時間からPlasencia時間への変換
21:54:19
-1
20:54:19
+7
+7
+6
+6
+6
+6
+6
+5
+5
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+2
+2
+1.5
+1
+0.5
+0
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-1
-1
-1
-1
-2
-2
-2
-2
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-2
-3
-6
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