Port Alfred time to Half Way Tree time conversion
22:20:51
-7
15:20:51
+7
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+3.5
+3.5
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+3.5
+3.5
+3
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+2.5
+2
+1.5
+1
+1
+1
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+0
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-1
-1
-1
-1
-1
-1
-1
-2
-2
-5
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-5
-5
-6
-7
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-7
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-10