diff --git a/app/scodoc/sco_preferences.py b/app/scodoc/sco_preferences.py
index 99080600bb..ec21d00954 100644
--- a/app/scodoc/sco_preferences.py
+++ b/app/scodoc/sco_preferences.py
@@ -642,6 +642,17 @@ class BasePreferences(object):
                     "category": "assi",
                 },
             ),
+            (
+                "non_travail",
+                {
+                    "initvalue": "sam, dim",
+                    "title": "Jours non travaillés",
+                    "size": 40,
+                    "category": "assi",
+                    "only_global": True,
+                    "explanation": "Liste des jours (lun,mar,mer,jeu,ven,sam,dim)",
+                },
+            ),
             # portal
             (
                 "portal_url",
diff --git a/app/static/css/assiduites.css b/app/static/css/assiduites.css
index 1301044f44..701cdc9be8 100644
--- a/app/static/css/assiduites.css
+++ b/app/static/css/assiduites.css
@@ -28,6 +28,9 @@
 .infos {
     position: relative;
     width: fit-content;
+    display: flex;
+    justify-content: space-evenly;
+    align-content: center;
 }
 
 #datestr {
@@ -36,6 +39,9 @@
     border: 1px #444 solid;
     border-radius: 5px;
     padding: 5px;
+    min-width: 100px;
+    display: inline-block;
+    min-height: 20px;
 }
 
 #tl_slider {
diff --git a/app/static/js/assiduites.js b/app/static/js/assiduites.js
index 2a23256032..d3264bc154 100644
--- a/app/static/js/assiduites.js
+++ b/app/static/js/assiduites.js
@@ -467,7 +467,18 @@ function updateDate() {
 
   const date = dateInput.valueAsDate;
 
-  $("#datestr").text(formatDate(date).capitalize());
+  if (!verifyNonWorkDays(date.getDay(), nonWorkDays)) {
+    $("#datestr").text(formatDate(date).capitalize());
+    dateInput.setAttribute("value", date.toISOString().split("T")[0]);
+    return true;
+  } else {
+    const att = document.createTextNode(
+      "Le jour sélectionné n'est pas un jour travaillé."
+    );
+    openAlertModal("Erreur", att, "", "crimson");
+    dateInput.value = dateInput.getAttribute("value");
+    return false;
+  }
 }
 
 function verifyDateInSemester() {
@@ -519,6 +530,39 @@ function formatDateModal(str, separator = "·") {
   return new moment.tz(str, TIMEZONE).format(`DD/MM/Y ${separator} HH:mm`);
 }
 
+/**
+ * Vérifie si la date sélectionnée n'est pas un jour non travaillé
+ * Renvoie Vrai si le jour est non travaillé
+ */
+function verifyNonWorkDays(day, nonWorkdays) {
+  let d = "";
+  switch (day) {
+    case 0:
+      d = "dim";
+      break;
+    case 1:
+      d = "lun";
+      break;
+    case 2:
+      d = "mar";
+      break;
+    case 3:
+      d = "mer";
+      break;
+    case 4:
+      d = "jeu";
+      break;
+    case 5:
+      d = "ven";
+      break;
+    case 6:
+      d = "sam";
+      break;
+  }
+
+  return nonWorkdays.indexOf(d) != -1;
+}
+
 /**
  * Fonction qui vérifie si une période est dans un interval
  * Objet période / interval
@@ -573,7 +617,9 @@ function isConflictSameAsTimeLine(conflict) {
  * @returns {Date} la date sélectionnée
  */
 function getDate() {
-  const date = document.querySelector("#tl_date").valueAsDate;
+  const date = new Date(
+    document.querySelector("#tl_date").getAttribute("value")
+  );
   date.setHours(0, 0, 0, 0);
   return date;
 }
diff --git a/app/templates/assiduites/signal_assiduites_etud.j2 b/app/templates/assiduites/signal_assiduites_etud.j2
index 100528acf5..7e77f7b49e 100644
--- a/app/templates/assiduites/signal_assiduites_etud.j2
+++ b/app/templates/assiduites/signal_assiduites_etud.j2
@@ -37,7 +37,7 @@
 
     <div class="infos">
         Date: <span id="datestr"></span>
-        <input type="date" name="tl_date" id="tl_date" value="{{ date }}" onchange="updateDate()">
+        <input type="date" name="tl_date" id="tl_date" value="{{ date }}">
     </div>
 
     {{timeline|safe}}
@@ -70,11 +70,16 @@
 
     <script>
         const etudid = {{ sco.etud.id }};
+        const nonWorkDays = [{{ nonworkdays| safe }}];
+
         setupDate(() => {
-            actualizeEtud(etudid);
-            updateSelect()
+            if (updateDate()) {
+                actualizeEtud(etudid);
+                updateSelect()
+            }
         });
 
+
         setupTimeLine(() => {
             updateJustifyBtn();
         });
diff --git a/app/templates/assiduites/signal_assiduites_group.j2 b/app/templates/assiduites/signal_assiduites_group.j2
index 0446606cc8..7bf85c0288 100644
--- a/app/templates/assiduites/signal_assiduites_group.j2
+++ b/app/templates/assiduites/signal_assiduites_group.j2
@@ -70,6 +70,8 @@
     {% include "assiduites/prompt.j2" %}
 
     <script>
+        const nonWorkDays = [{{ nonworkdays| safe }}];
+
         updateDate();
         setupDate();
         setupTimeLine();
diff --git a/app/views/assiduites.py b/app/views/assiduites.py
index 08d083aed5..22652d93ee 100644
--- a/app/views/assiduites.py
+++ b/app/views/assiduites.py
@@ -207,6 +207,7 @@ def signal_assiduites_etud():
             lunch=lunch,
             timeline=_timeline(),
             afternoon=afternoon,
+            nonworkdays=_non_work_days(),
             forcer_module=sco_preferences.get_preference(
                 "forcer_module", dept_id=g.scodoc_dept_id
             ),
@@ -214,6 +215,12 @@ def signal_assiduites_etud():
     ).build()
 
 
+def _non_work_days():
+    non_travail = sco_preferences.get_preference("non_travail", None)
+    non_travail = non_travail.replace(" ", "").split(",")
+    return ",".join([f"'{i.lower()}'" for i in non_travail])
+
+
 def _str_to_num(string: str):
     parts = [*map(float, string.split(":"))]
     hour = parts[0]
@@ -395,6 +402,7 @@ def signal_assiduites_group():
             grp=sco_groups_view.menu_groups_choice(groups_infos),
             moduleimpl_select=_module_selector(formsemestre, moduleimpl_id),
             timeline=_timeline(),
+            nonworkdays=_non_work_days(),
             formsemestre_date_debut=str(formsemestre.date_debut),
             formsemestre_date_fin=str(formsemestre.date_fin),
             forcer_module=sco_preferences.get_preference(