Conversione dell'ora da Gries a Niagara Falls
21:33:36
-6
15:33:36
+7
+7
+7
+7
+7
+6
+6
+6
+6
+6
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+5
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+4
+3.5
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+3
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+2
+1.5
+1
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+1
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+0
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-1
-1
-1
-1
-1
-1
-2
-5
-5
-5
-6
-6
-6
-7
-7
-8
-9