diff --git a/config.py b/config.py
index 8ad045d805..d98e951384 100755
--- a/config.py
+++ b/config.py
@@ -41,6 +41,7 @@ class Config:
     # flask_json:
     JSON_ADD_STATUS = False
     JSON_USE_ENCODE_METHODS = True
+    JSON_DATETIME_FORMAT = "%Y-%m-%dT%H:%M:%S%z"  # "%Y-%m-%dT%H:%M:%S"
 
 
 class ProdConfig(Config):