Riyadh時間からBerwick時間への変換
12:31:55
+8
20:31:55
+6
+6
+6
+6
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+5
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+5
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+1
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-1
-1
-1
-1
-2
-2
-2
-2
-2
-2
-3
-3
-3
-6
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-6
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-8
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-8
-9
-11