diff --git a/app/celery/nightly_tasks.py b/app/celery/nightly_tasks.py
index b561fa1bb..5437422c0 100644
--- a/app/celery/nightly_tasks.py
+++ b/app/celery/nightly_tasks.py
@@ -100,7 +100,9 @@ def _delete_notifications_older_than_retention_by_type(notification_type):
             'datetime_to_delete_before': day_to_delete_backwards_from
         })
 
-    seven_days_ago = get_local_midnight_in_utc(convert_utc_to_local_timezone(datetime.utcnow()).date() - timedelta(days=7))
+    seven_days_ago = get_local_midnight_in_utc(
+        convert_utc_to_local_timezone(datetime.utcnow()).date() - timedelta(days=7)
+    )
     service_ids_with_data_retention = {x.service_id for x in flexible_data_retention}
 
     # get a list of all service ids that we'll need to delete for. Typically that might only be 5% of services.
diff --git a/app/dao/date_util.py b/app/dao/date_util.py
index 08fa4186a..94d6cb3cb 100644
--- a/app/dao/date_util.py
+++ b/app/dao/date_util.py
@@ -1,11 +1,10 @@
 from datetime import date, datetime, time, timedelta
-from os import getenv
 
 import pytz
 from notifications_utils.timezones import (
     convert_local_timezone_to_utc,
     convert_utc_to_local_timezone,
-    local_timezone
+    local_timezone,
 )
 
 
diff --git a/app/utils.py b/app/utils.py
index c483cbe76..883eff9ce 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -1,14 +1,13 @@
 from datetime import datetime, timedelta
 from os import getenv
 
-import pytz
 from flask import url_for
 from notifications_utils.template import (
     HTMLEmailTemplate,
     LetterPrintTemplate,
     SMSMessageTemplate,
 )
-from notifications_utils.timezones import convert_local_timezone_to_utc, local_timezone
+from notifications_utils.timezones import convert_local_timezone_to_utc
 from sqlalchemy import func
 
 DATETIME_FORMAT_NO_TIMEZONE = "%Y-%m-%d %H:%M:%S.%f"