Cairo時間からDa Nang時間への変換
15:15:22
+4
19:15:22
+7
+7
+6
+6
+6
+6
+6
+5
+5
+5
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+2
+2
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+1
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+0
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-1
-1
-1
-1
-2
-2
-2
-2
-2
-2
-3
-6
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-6
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-7
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-10