CMB Date-Time Metaboxes

function date_time_metaboxes( $meta_boxes ) {
    $prefix = '_cmb_'; // Prefix for all fields

    $meta_boxes[] = array(
        'id' => 'date-time',
        'title' => 'Date and Time:',
        'pages' => array('report'), // post type
        'context' => 'side',
        'priority' => 'high',
        'show_names' => true, // Show field names on the left
        'pages' => array('report'), // post type
        'fields' => array(

            array(
                'name' => 'Start Date:',
                'desc' => '',
                'id'   => $prefix . 'event_start_date',
                'type' => 'text_date_timestamp',
            ),
                array(
                'name' => 'Start Time:',
                'desc' => '',
                'id'   => $prefix . 'event_start_time',
                'type' => 'text_time',
            ),
                array(
                'name' => 'End Date:',
                'desc' => '',
                'id'   => $prefix . 'event_end_date',
                'type' => 'text_date_timestamp',
            ),
                array(
                'name' => 'End Time:',
                'desc' => '',
                'id'   => $prefix . 'event_end_time',
                'type' => 'text_time',
            ),
        ),
    );

    return $meta_boxes;
}