You can set search col data type to date/datetime/time etc to make search more friendly. Default type is text. For example When you set search column data type to date-range, it will show date range options.
$pdocrud = new PDOCrud();
//set the search column data type
$pdocrud->setSearchColumnDataType("order_date", "date-range");// other options are time-range, datetime-range
echo $pdocrud->dbTable("orders")->render();