cutox

	$cmb_call = new_cmb2_box( array(
		'id'            => 'call_metabox',
		'title'         => __( 'Calendario', 'cmb2' ),
		'object_types'  => array( 'call' ),
		'context'       => 'normal',
		'priority'      => 'high',
		'show_names'    => true,
	) );

	$cmb_call_date_group = $cmb_call->add_field( array(
	    'id'          => '_call_calendar',
	    'type'        => 'group',
	    'escape_cb' => false,
	    'repeatable'  => true,
 	    'options'     => array(
	        'group_title'   => __( 'Sessione {#}', 'cmb' ), // since version 1.1.4, {#} gets replaced by row number
	        'add_button'    => __( 'Aggiungi', 'cmb' ),
	        'remove_button' => __( 'Rimuovi', 'cmb' ),
	        'closed'    	=> false,
	        'sortable'      => true, // beta
 	    ),
 	    'sortable' =>true
	) );
	
	$cmb_call->add_group_field( $cmb_call_date_group, array(
		'name' => __( 'DateTime', 'cmb2' ),
 		'id'   => 'session',
		'type' => 'text_datetime_timestamp',
		'date_format' => 'Y-m-d',
		'time_format' => 'H:i',
	));