Helsinki時間からDerry時間への変換
15:15:07
-2
13:15:07
+7
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+6
+6
+6
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+5
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+2
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+1
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+0
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-1
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-1
-1
-2
-2
-2
-2
-2
-2
-3
-6
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-6
-7
-7
-7
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-10