diff --git a/copanier/__init__.py b/copanier/__init__.py
index cef6f42..80dc840 100644
--- a/copanier/__init__.py
+++ b/copanier/__init__.py
@@ -55,11 +55,11 @@ env = Environment(
 
 
 def date_filter(value):
-    return value.strftime("%d %B")
+    return value.strftime(r"%A %d %B")
 
 
 def time_filter(value):
-    return value.strftime("%H:%M")
+    return value.strftime(r"%H:%M")
 
 
 env.filters["date"] = date_filter