diff --git a/codi-app/CodiFunctions.py b/codi-app/CodiFunctions.py
index c2788e9..ab3955d 100644
--- a/codi-app/CodiFunctions.py
+++ b/codi-app/CodiFunctions.py
@@ -64,7 +64,7 @@ def GetModemSignalInfo():
 def GetDateTime():
     now = datetime.now()
     mtkCmd.DateTimeInfo(int(now.strftime('%d')),
-    int(now.strftime('%m')),
+    int(now.strftime('%m'))-1,
         int(now.strftime('%Y')),
         int(now.strftime('%H')),
         int(now.strftime('%M')),