Kingori時間からHo Chi Minh City時間への変換
16:30:09
+4
20:30:09
+6
+6
+6
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+5
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+2
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+1.5
+1
+0.5
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-1
-1
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-1
-1
-1
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-2
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-2
-3
-3
-6
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