Protaras時間からWest Island時間への変換
16:59:04
+3.5
20:29:04
+7
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+6
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+5
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+2.5
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+1.5
+1
+0.5
+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
-8
-8
-9
-10