Saint Petersburg時間からStanley時間への変換
18:20:12
-6
12:20:12
+7
+7
+6
+6
+6
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+5
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+2.5
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+2
+2
+1.5
+1
+0.5
+0
+0
+0
+0
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-1
-1
-1
-1
-2
-2
-2
-2
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-3
-6
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-10