diff --git a/app/api/assiduites.py b/app/api/assiduites.py
index 23c9e2fd2d..b3ed9a5804 100644
--- a/app/api/assiduites.py
+++ b/app/api/assiduites.py
@@ -454,7 +454,7 @@ def count_assiduites_formsemestre(
 @permission_required(Permission.AbsChange)
 def assiduite_create(etudid: int = None, nip=None, ine=None):
     """
-    Création d'une assiduité pour l'étudiant (etudid)
+    Enregistrement d'assiduités pour un étudiant (etudid)
     La requête doit avoir un content type "application/json":
     [
         {
@@ -479,7 +479,7 @@ def assiduite_create(etudid: int = None, nip=None, ine=None):
             404,
             message="étudiant inconnu",
         )
-    if not hasattr(g, "scodoc_dept_id") and etud.dept_id is not None:
+    if g.scodoc_dept is None and etud.dept_id is not None:
         # route sans département
         set_sco_dept(etud.departement.acronym)
     create_list: list[object] = request.get_json(force=True)
@@ -490,7 +490,7 @@ def assiduite_create(etudid: int = None, nip=None, ine=None):
     errors: list = []
     success: list = []
     for i, data in enumerate(create_list):
-        code, obj = _create_singular(data, etud)
+        code, obj = _create_one(data, etud)
         if code == 404:
             errors.append({"indice": i, "message": obj})
         else:
@@ -544,11 +544,11 @@ def assiduites_create():
         if etud is None:
             errors.append({"indice": i, "message": "Cet étudiant n'existe pas."})
             continue
-        if not hasattr(g, "scodoc_dept_id") and etud.dept_id is not None:
+        if g.scodoc_dept is None and etud.dept_id is not None:
             # route sans département
             set_sco_dept(etud.departement.acronym)
 
-        code, obj = _create_singular(data, etud)
+        code, obj = _create_one(data, etud)
         if code == 404:
             errors.append({"indice": i, "message": obj})
         else:
@@ -558,7 +558,7 @@ def assiduites_create():
     return {"errors": errors, "success": success}
 
 
-def _create_singular(
+def _create_one(
     data: dict,
     etud: Identite,
 ) -> tuple[int, object]:
@@ -582,6 +582,8 @@ def _create_singular(
     deb = scu.is_iso_formated(date_debut, convert=True)
     if deb is None:
         errors.append("param 'date_debut': format invalide")
+    elif deb.tzinfo is None:
+        deb = scu.localize_datetime(deb)
 
     # cas 3 : date_fin
     date_fin = data.get("date_fin", None)
@@ -590,9 +592,10 @@ def _create_singular(
     fin = scu.is_iso_formated(date_fin, convert=True)
     if fin is None:
         errors.append("param 'date_fin': format invalide")
+    elif fin.tzinfo is None:
+        fin = scu.localize_datetime(fin)
 
     # cas 5 : desc
-
     desc: str = data.get("desc", None)
 
     external_data = data.get("external_data", None)
diff --git a/app/api/justificatifs.py b/app/api/justificatifs.py
index bac373bff7..f5b804bb56 100644
--- a/app/api/justificatifs.py
+++ b/app/api/justificatifs.py
@@ -279,7 +279,7 @@ def justif_create(etudid: int = None, nip=None, ine=None):
     success: list = []
     justifs: list = []
     for i, data in enumerate(create_list):
-        code, obj, justi = _create_singular(data, etud)
+        code, obj, justi = _create_one(data, etud)
         if code == 404:
             errors.append({"indice": i, "message": obj})
         else:
@@ -291,7 +291,7 @@ def justif_create(etudid: int = None, nip=None, ine=None):
     return {"errors": errors, "success": success}
 
 
-def _create_singular(
+def _create_one(
     data: dict,
     etud: Identite,
 ) -> tuple[int, object]:
diff --git a/app/decorators.py b/app/decorators.py
index d8816d6180..85b17a33af 100644
--- a/app/decorators.py
+++ b/app/decorators.py
@@ -44,6 +44,7 @@ def scodoc(func):
     Set `g.scodoc_dept` and `g.scodoc_dept_id` if `scodoc_dept` is present
     in the argument (for routes like
     `/<scodoc_dept>/Scolarite/sco_exemple`).
+    Else set scodoc_dept=None, scodoc_dept_id=-1.
     """
 
     @wraps(func)
diff --git a/app/models/assiduites.py b/app/models/assiduites.py
index 766196c35b..a78e709dfe 100644
--- a/app/models/assiduites.py
+++ b/app/models/assiduites.py
@@ -134,6 +134,12 @@ class Assiduite(db.Model):
         notify_mail=False,
     ) -> "Assiduite":
         """Créer une nouvelle assiduité pour l'étudiant"""
+        if date_debut.tzinfo is None:
+            log(
+                f"Warning: create_assiduite: date_debut without timezone ({date_debut})"
+            )
+        if date_fin.tzinfo is None:
+            log(f"Warning: create_assiduite: date_fin without timezone ({date_fin})")
         # Vérification de non duplication des périodes
         assiduites: Query = etud.assiduites
         if is_period_conflicting(date_debut, date_fin, assiduites, Assiduite):
diff --git a/app/scodoc/sco_abs_notification.py b/app/scodoc/sco_abs_notification.py
index 057d71913e..6d2923236a 100644
--- a/app/scodoc/sco_abs_notification.py
+++ b/app/scodoc/sco_abs_notification.py
@@ -60,8 +60,8 @@ def abs_notify(etudid: int, date: str | datetime.datetime):
     """
     from app.scodoc import sco_assiduites
 
-    if current_app and current_app.config["DEBUG"]:
-        return
+    # if current_app and current_app.config["DEBUG"]:
+    #    return
 
     formsemestre = retreive_current_formsemestre(etudid, date)
     if not formsemestre:
diff --git a/app/scodoc/sco_preferences.py b/app/scodoc/sco_preferences.py
index 88970b6b99..ea95821f78 100644
--- a/app/scodoc/sco_preferences.py
+++ b/app/scodoc/sco_preferences.py
@@ -285,6 +285,7 @@ class BasePreferences:
     def __init__(self, dept_id: int):
         dept = db.session.get(Departement, dept_id)
         if not dept:
+            log(f"BasePreferences: Invalid departement: {dept_id}")
             raise ScoValueError(f"BasePreferences: Invalid departement: {dept_id}")
         self.dept_id = dept.id
         self.init()
diff --git a/app/scodoc/sco_utils.py b/app/scodoc/sco_utils.py
index 5baba63447..7a93198e74 100644
--- a/app/scodoc/sco_utils.py
+++ b/app/scodoc/sco_utils.py
@@ -76,6 +76,7 @@ STATIC_DIR = (
     os.environ.get("SCRIPT_NAME", "") + "/ScoDoc/static/links/" + sco_version.SCOVERSION
 )
 # La time zone du serveur:
+# Attention: suppose que la timezone utilisée par postgresql soit la même !
 TIME_ZONE = timezone("/".join(os.path.realpath("/etc/localtime").split("/")[-2:]))
 
 # ----- CALCUL ET PRESENTATION DES NOTES
@@ -251,7 +252,8 @@ def is_period_overlapping(
     """
     Vérifie si la période et l'interval s'intersectent
     si strict == True : les extrémitées ne comptes pas
-    Retourne Vrai si c'est le cas, faux sinon
+    Retourne Vrai si c'est le cas, faux sinon.
+    Attention: offset-aware datetimes
     """
     p_deb, p_fin = periode
     i_deb, i_fin = interval
diff --git a/sco_version.py b/sco_version.py
index 2fb32fb908..c9cbef32f0 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.6.43"
+SCOVERSION = "9.6.44"
 
 SCONAME = "ScoDoc"