Moved dtype setting function to finalize output function

Author: wshaoul

pandas/io/parsers/arrow_parser_wrapper.py

@@ -217,6 +217,9 @@ def _finalize_pandas_output(self, frame: DataFrame) -> DataFrame:
             except TypeError as err:
                 # GH#44901 reraise to keep api consistent
                 raise ValueError(str(err)) from err
+            
+        self._set_date_column_dtype(frame, date_columns=["date_column1", "date_column2"], dtype="timestamp[ns][pyarrow]")
+
         return frame
 
     def _validate_usecols(self, usecols) -> None:
@@ -306,8 +309,6 @@ def read(self) -> DataFrame:
 
             else:
                 frame = table.to_pandas()
-
-            self._set_date_column_dtype(frame, date_columns=["date_column1", "date_column2"], dtype="timestamp[ns][pyarrow]")
 
         return self._finalize_pandas_output(frame)