Not working properly

I can’t create an event with a proper date (start and end). After saving it the editor alway shows today’s date. In the All Events window I get lot’s of errors like “Warning: date() expects parameter 2 to be long, string given in /var/www/xqueue.com/wordpress/wp-includes/functions.php on line 104”.

Only events where I select today’s date are saved correctly.

The shortcode output in the page still shows nothing that the widget title and a link to the All events landing page.