Balfour時間からDiffa時間への変換
10:10:33
-1
09:10:33
+7
+7
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+7
+7
+6
+6
+6
+6
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+3
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+2
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+1
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+1
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-1
-1
-1
-1
-1
-1
-2
-5
-5
-5
-5
-6
-6
-7
-7
-8
-9