Brits時間からTonekābon時間への変換
21:17:33
+1.5
22:47:33
+7
+7
+7
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+7
+6
+6
+6
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+3.5
+3.5
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+3
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+1.5
+1
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-1
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-5
-5
-5
-5
-6
-6
-7
-7
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-9