diff --git a/py3o_report.py b/py3o_report.py
index f84578ad..73391661 100644
--- a/py3o_report.py
+++ b/py3o_report.py
@@ -32,6 +32,11 @@ class py3o_report(report_sxw):
                                [('code', '=', lang_code)],
                                context=context)[0]
         return lang_obj.browse(cr, uid, lang, context=context)
+    
+    def format_date(self, date, values):
+        ''' Return a date formatted according to the language extracted from
+        the "values" argument (which should be the result of get_values). '''
+        return date.strftime(values['lang'].date_format)
 
     def create(self, cr, uid, ids, data, context=None):
         # Find the report definition to get its settings.