[DateTimeFormatter] Format DateTime values correctly

[davidwindell]

Fixes error;

Notice: Undefined variable: dateTime in ...zendframework\library\Zend\Filter\DateTimeFormatter.php on line 82

Fatal error: Call to a member function format() on a non-object in ...zendframework\library\Zend\Filter\DateTimeFormatter.php on line 82

[gregorybesson]

Thanks a lot David,

Seems much better (and you have even found enough time to create the Unit test !)

I'm impressed by your velocity.

See ya