Al-`Ula時間からDiffa時間への変換
17:21:48
-2
15:21:48
+7
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+6
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+5
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+2
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+1
+0.5
+0
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-1
-1
-1
-1
-2
-2
-2
-2
-2
-2
-3
-6
-6
-6
-7
-7
-7
-8
-8
-9
-10