Geiro 시간을 London 시간으로 변환
19:31:22
-3
16:31:22
+6
+6
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+2
+2
+1.5
+1
+0.5
+0
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+0
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+0
+0
-1
-1
-1
-1
-2
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-2
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-3
-3
-6
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-11