diff --git a/app/__init__.py b/app/__init__.py
index 25ea4f6b..972cff62 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -1,6 +1,7 @@
 # -*- coding: UTF-8 -*
 # pylint: disable=invalid-name
 
+import datetime
 import os
 import socket
 import sys
@@ -53,7 +54,14 @@ def handle_sco_value_error(exc):
 def internal_server_error(e):
     """Bugs scodoc, erreurs 500"""
     # note that we set the 500 status explicitly
-    return render_template("error_500.html", SCOVERSION=sco_version.SCOVERSION), 500
+    return (
+        render_template(
+            "error_500.html",
+            SCOVERSION=sco_version.SCOVERSION,
+            date=datetime.datetime.now().isoformat(),
+        ),
+        500,
+    )
 
 
 def handle_invalid_usage(error):
@@ -93,6 +101,7 @@ class LogRequestFormatter(logging.Formatter):
             record.url = None
             record.remote_addr = None
         record.sco_user = current_user
+        record.sco_admin_mail = current_app.config["SCODOC_ADMIN_MAIL"]
 
         return super().format(record)
 
@@ -120,7 +129,7 @@ class LogExceptionFormatter(logging.Formatter):
             record.http_method = None
             record.http_params = None
         record.sco_user = current_user
-
+        record.sco_admin_mail = current_app.config["SCODOC_ADMIN_MAIL"]
         return super().format(record)
 
 
@@ -197,12 +206,14 @@ def create_app(config_class=DevConfig):
         "[%(asctime)s] %(sco_user)s@%(remote_addr)s requested %(url)s\n"
         "%(levelname)s: %(message)s"
     )
+    # les champs additionnels sont définis dans LogRequestFormatter
     scodoc_exc_formatter = LogExceptionFormatter(
         "[%(asctime)s] %(sco_user)s@%(remote_addr)s requested %(url)s\n"
         "%(levelname)s: %(message)s\n"
         "Referrer: %(http_referrer)s\n"
         "Method: %(http_method)s\n"
         "Params: %(http_params)s\n"
+        "Admin mail: %(sco_admin_mail)s\n"
     )
     if not app.testing:
         if not app.debug:
diff --git a/app/templates/error_500.html b/app/templates/error_500.html
index 23963376..d986a00d 100644
--- a/app/templates/error_500.html
+++ b/app/templates/error_500.html
@@ -4,8 +4,9 @@
 {% block title %}Une erreur est survenue !{% endblock %}
 {% block body %}
 <h1>Une erreur est survenue !</h1>
-<p>Oops... <span style="color:red;"><b>ScoDoc version <span style="font-size: 120%;">{{SCOVERSION}}</span></b></span> a
+<p>Oups...</tt> <span style="color:red;"><b>ScoDoc version <span style="font-size: 120%;">{{SCOVERSION}}</span></b></span> a
     un problème, désolé.</p>
+<p><tt style="font-size:60%">{{date}}</tt></p>
 
 <p> Si le problème persiste, contacter l'administrateur de votre site,
     ou écrire la liste "notes" <a href="mailto:notes@listes.univ-paris13.fr">notes@listes.univ-paris13.fr</a> en