Biddulph時間からImperial時間への変換
17:16:47
-5
12:16:47
+7
+7
+7
+6.5
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+6
+6
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+5.5
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+2
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+1
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+1
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+0
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-3
-3
-3
-3
-4
-4
-5
-5
-6
-7