Wrong month translation

You can define the STAGESHOW_DATETIME_BOXOFFICE_FORMAT constant in your wp-config.php file to specify your own date and time format for any stageshow version. (In your case d/m/Y H:i will do what you want)

For sample code to do this, and a number of other customisations along with accompanying descriptions, refer to stageshow_wp-config_sample.php which is in the root folder of the stageshow plugin.