diff --git a/_extensions/cours/_extension.yml b/_extensions/cours/_extension.yml
index d6087b0..4ef139b 100644
--- a/_extensions/cours/_extension.yml
+++ b/_extensions/cours/_extension.yml
@@ -2,7 +2,6 @@ title: Cours
 author: Jeff LANCE
 version: 1.0.0
 quarto-required: ">=1.7.0"
-date-format: DD/MM/YYYY
 contributes:
   formats:
     pdf: