Start and end dates for filters are stored in params and not as individual table columns.
Testing Instructions
Set error reporting to maximum.
Create a new filter or modify an existing one. You should see "PHP Notice: Undefined property: FinderTableFilter::$d2 in ROOT/administrator/components/com_finder/tables/filter.php on line 83"
Apply this PR and try again.
Also try entering a start date which is after the end date. After saving the dates should be swapped.
I have tested this item successfully on 2be76dd
This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/10192.