Conversion de l'heure de Piet Retief à l'heure de São Paulo
18:56:30
-5
13:56:30
+7
+7
+7
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+6
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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