Date formatting

Found a solution for merging my date and time field to one. This could help you:
functions.php

add_action( 'admin_init', 'prefix_add_custom_columns', 20 );
function prefix_add_custom_columns() {
    require_once get_stylesheet_directory() . '/my_theme/divi/Prefix_Custom_Admin_Columns.php';
    new Prefix_Custom_Admin_Columns( 'my_cpt', array() );
}

The Class:

class Prefix_Custom_Admin_Columns extends MB_Admin_Columns_Post {
    public function columns( $columns ) {
        $columns  = parent::columns( $columns );
        $this->add( $columns, 'cpt_start', 'Start', 'before', 'date' );
        return $columns;
    }
    public function show( $column, $post_id ) {
        $value = rwmb_the_value( $column, '', $post_id, false );

        switch ( $column ) {
            case 'cpt_start':
                $value = date( 'd.m.Y', strtotime( $value ) );
                if( $value == '01.01.1970' ) {
                    echo '-/-';
                } else {
                    echo $value;
                }
                $value = rwmb_the_value( 'cpt_start_time', '', $post_id, false  );
                if( $value != '' && !is_null( $value ) ){
                    echo ' ( '.$value.' )';
                }
                break;
        }
    }
}