Hi,
By default that follows the wordpress date formatting, however it is possible to specify a custom date format as well. It is still an experimental feature, but it might work. Try changing the advanced description field, by adding the date_format argument, like so:
<p class="event-date">{_event_start_date date_format="d/m/Y"} - {_event_end_date date_format="d/m/Y"} - {_event_start_time date_format="g:i a"} - {_event_end_time date_format="g:i a"}</p>
<p class="event-desc">{descriptionfield}</p>I have taken this from the events calendar configuration, so I think this should be correct.