การแปลงเวลาDerryเป็นเวลาCairo
12:51:27
+2
14:51:27
+7
+7
+7
+6.5
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+6
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+5.5
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+5
+5
+4.5
+4
+3.5
+3
+3
+3
+3
+3
+3
+3
+2
+2
+2
+2
+1
+1
+1
+1
+1
+1
+0
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-3
-3
-3
-3
-4
-4
-5
-5
-6
-7