diff --git a/ITPlanning/api/__init__.py b/ITPlanning/api/__init__.py
index 6e5a747..55f692b 100644
--- a/ITPlanning/api/__init__.py
+++ b/ITPlanning/api/__init__.py
@@ -1,7 +1,23 @@
 from flask import Blueprint
+from flask.json import JSONEncoder
+from datetime import datetime
+
+
+class CustomJsonEncoder(JSONEncoder):
+    def default(self, obj):
+        try:
+            if isinstance(obj, datetime):
+                return obj.strftime("%Y-%m-%dT%H%M")
+            iterable = iter(obj)
+        except TypeError:
+            pass
+        else:
+            return list(iterable)
+        return JSONEncoder.default(self, obj)
+
 
 api = Blueprint("api", __name__)
-
+api.json_encoder = CustomJsonEncoder
 from .errors import *
 from .appointement import *
 from .planning import *