updated the README file and updated the regression test and output.
As mentioned in the another thread of to_date(text) double quote for nls_date_format is not appropriate so I did the same changes for to_char function also.
Example:
-set orafce.nls_date_format="YY-DDMon HH24:MI:SS";
+set orafce.nls_date_format='YY-DDMon HH24:MI:SS';

by Vinayak Pokale