Conversion de l'heure de Nyala à l'heure de Rio Grande
23:21:15
-5
18:21:15
+7
+7
+7
+7
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+6
+6
+6
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+3
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+1
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-1
-1
-1
-1
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-2
-5
-5
-5
-6
-6
-6
-7
-7
-8
-9