diff --git a/app/scodoc/sco_edt_cal.py b/app/scodoc/sco_edt_cal.py
index 91e3d6561..be0112042 100644
--- a/app/scodoc/sco_edt_cal.py
+++ b/app/scodoc/sco_edt_cal.py
@@ -222,18 +222,22 @@ def translate_calendar(
         if group and group_ids_set and group.id not in group_ids_set:
             continue  # ignore cet évènement
         modimpl: ModuleImpl | bool = event["modimpl"]
+        params = {
+            "scodoc_dept": g.scodoc_dept,
+            "group_ids": group.id,
+            "heure_deb": event["heure_deb"].replace("h", ":") if "h" in event["heure_deb"] else event["heure_deb"],
+            "heure_fin": event["heure_fin"].replace("h", ":") if "h" in event["heure_fin"] else event["heure_fin"],
+            "day": event["jour"]
+        }
+        if modimpl:
+             params["moduleimpl_id"] = modimpl.id
+        elif group:
+             params["formsemestre_id"] = group.partition.formsemestre_id
+
         url_abs = (
-            url_for(
-                "assiduites.signal_assiduites_group",
-                scodoc_dept=g.scodoc_dept,
-                group_ids=group.id,
-                heure_deb=event["heure_deb"],
-                heure_fin=event["heure_fin"],
-                moduleimpl_id=modimpl.id,
-                day=event["jour"],
-            )
-            if modimpl and group
-            else None
+            url_for("assiduites.signal_assiduites_group", **params)
+              if group
+              else None
         )
         match modimpl:
             case False:  # EDT non configuré