Conversion de l'heure de Madrid à l'heure de Waltham
23:48:27
-6
17:48:27
+7
+7
+7
+7
+7
+6
+6
+6
+6
+6
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+4
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+3.5
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+3
+3
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+2
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+1
+1
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-1
-1
-1
-1
-1
-1
-2
-5
-5
-5
-6
-6
-6
-7
-7
-8
-9