Onega時間からSurat時間への変換
18:08:52
+2.5
20:38:52
+6
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+1.5
+1
+0.5
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-1
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-1
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-2
-2
-2
-2
-2
-2
-3
-6
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-6
-6
-7
-7
-8
-8
-9
-10