if(isset($_POST['job_from_date'], $_POST['job_to_date'])) {

    $date_before = array(
        'key' => 'job_from_date',                           // job_from_date name of ACF datepicker
        'value' => $_POST['job_from_date'],
        'type' => 'DATE',
        'compare' => '<='
    );
    foreach ($date_before as $key => $db){                  // I am trying to convert the date format
        if ($key == 'value'){
            $datebefore_Y = date( 'Y', strtotime($db) );
            $datebefore_M = date( 'm', strtotime($db) );
            $datebefore_D = date( 'd', strtotime($db) );
        }
    }

    $date_after = array(
        'key' => 'job_to_date',                             // job_to_date name of ACF datepicker
        'value' => $_POST['job_to_date'],
        'type' => 'DATE',
        'compare' => '=>'
    );
    foreach ($date_after as $key => $da){                   // I am trying to convert the date format
        if ($key == 'value'){
            $dateafter_Y = date( 'Y', strtotime($da) );
            $dateafter_M = date( 'm', strtotime($da) );
            $dateafter_M = date( 'd', strtotime($da) );
        }
    }

    $jobs_args = array(
        'post_type'=> 'jobs_post',
        'date_query' => array(
            'before' => array(
                'year' => $datebefore_Y,
                'month' => $datebefore_M,
                'day' => $datebefore_D,
            ),
            'after' => array(
                'year' => $dateafter_Y,
                'month' => $dateafter_M,
                'day' => $dateafter_M,
            ),
        ),
        'orderby' => 'title',
        'order' => 'ASC',
        'posts_per_page' => -1
    );
    $jobs_query = new WP_Query($jobs_args);
}