Thank’s for no help, figured it out myselfe.
Open document wp-content/plugins/the-events-calendar/public/template-tags/general.php and find
$settings = array(
'datetime_separator' => ' @ ',
'same_year_format' => 'd. F',
'show_end_time' => true,
'time' => true,
);
Change the sparator or dateformat. done.
