diff --git a/mycaldav/models.py b/mycaldav/models.py
index d4a0e0c..cdf39cd 100644
--- a/mycaldav/models.py
+++ b/mycaldav/models.py
@@ -121,7 +121,7 @@ class cls_caldav_client():
         self.a_task = self.data.calendar(name="Tâche")
 
 
-        if datetime.today().day == 29:
+        if datetime.today().day == 1 and datetime.today().hour == 1:
             try:
                 with open(os.path.join("mycaldav", "last_sync_config.bin"), "rb") as file:
                     array = pickle.load(file)