Gries時間からHo Chi Minh City時間への変換
21:58:50
+5
02:58:50
+7
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+7
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+6
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+6
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+3
+3
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+2
+1.5
+1
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-1
-1
-1
-1
-1
-1
-2
-5
-5
-5
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-6
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-9