End after midnight feature works incorrent in 12 hour time format.

I found following fragment in code:

       if (!empty($settings['date_single_day']['end_after_midnight'])) {
         $start_time = $element['#value']['value']['time'];
         $end_time = $element['#value']['value2']['time'];
         if ($end_time < $start_time) {

This is resposnsible for adding one day to date. Unfortunately, this is behaving incorrectly. Variables $start_time and $end_time can be in 12 hours format (ie 06pm and 11am).

This code compares time lexically, not time-aware. In our example
'06pm' < '11am', while in 24 hour format it's identical to 18 < 11 which is obviously wrong. This makes "end after midnight" completely unusable.

I prepared patch for that issue, it solved problem for me.