Александр Суставов

{
"filmName":{
    "2014-08-20":
        ["10:20","16:15","18:25"],
    "2014-08-15":
        ["10:20","16:15","18:25"]
    }
}

Array ( [Неудержимые 3] => array( 2014-08-19 => array(10:20, 16:15, 18:25, 20:40, 23:00), 
    2014-08-19 => array(10:20, 16:15, 18:25, 20:40, 23:00) ) )

$myArray = array(...);

$remakeArray = function($myArray){
    $convertArray = array();

    for($key in $myArray){
        if($convertArray[$myArray[$key]["films_title_rus"]]){
            $convertArray[$myArray[$key]["films_title_rus"]] = array();
        }
        $convertArray[$myArray[$key]["films_title_rus"]][$myArray[$key]["schedule_date"]] = $myArray[$key]["schedule_time"];
    }
    return $convertArray;
};

$myArray = $remakeArray($myArray);