Jeddah時間からN'Djamena時間への変換
19:19:30
-2
17:19:30
+7
+7
+6
+6
+6
+6
+6
+5
+5
+5
+5
+5
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+2.5
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+2
+2
+1.5
+1
+0.5
+0
+0
+0
+0
+0
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-1
-1
-1
-1
-2
-2
-2
-2
-2
-2
-3
-6
-6
-6
-7
-7
-7
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-10