Use of the "template" shortcode argument

Hello !
I would like to customize the display of the list of events.
First, I display event with a widget, works fine, but I want some custom, turn this :

2ème COLLOQUE INTERNATIONAL D’IUFN
Takes place on December 2, 2013

into :

02/12/2013 | 2ème COLLOQUE INTERNATIONAL D’IUFN

So, I look at the shortcodes, and see the Tag: [eab_archive] and his param : template - (string) Subtemplate file, or template class call.
But I can't find any information on how to use this (and actually if this would do the job).
Thanks for your help !

Alain