Sort Posts By Custom Field Date?

Use meta_value instead of meta_value_num

<?php    $course = new wp_query( array ( 'posts_per_page' => '10' ,
                                         'post_type' => 'course',
                                         'orderby' => 'meta_value',
                                         'meta_key' => 'course_date',
                                         'order' => 'DESC'
                                        )
                                );
?>

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