diff --git a/backend/aci/proxy.py b/backend/aci/proxy.py
index 30c6284..b3a927e 100644
--- a/backend/aci/proxy.py
+++ b/backend/aci/proxy.py
@@ -11,7 +11,7 @@ from .utils import format_checkin_date
 router = APIRouter(prefix='/3p-proxy')
 
 def reformat_reject_date(date: str):
-    return format_checkin_date(datetime.strptime(date, '%a %b %d %Y'))
+    return format_checkin_date(datetime.strptime(date, '%Y-%m-%d'))
 
 def make_client_session():
     ssl_context = ssl.create_default_context(cafile=certifi.where())