Fixes #228 - Date time range search(list column search) is not proper due to timezone conversion (such as search in created time and modified time)

This reverts commit ec067d9b.

This reverts commit ff5b9ac4.

This reverts commit ad55e288.

fixing assigning by reference http://php.net/manual/en/language.operators.assignment.php "As of PHP 5, the new operator returns a reference automatically, so assigning the result of new by reference results in an E_DEPRECATED message in PHP 5.3 and later, and an E_STRICT message in earlier versions."