[odrs-web] Use UTC when comparing datetime

[Richard Hughes <rhughes src gnome org>]

commit 3c56b358f87a3083db2bfc6e8a04172a5c26d7ae
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jul 1 13:47:48 2019 +0100

    Use UTC when comparing datetime

 app_data/migrations/versions/b8243269e9cf_.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/app_data/migrations/versions/b8243269e9cf_.py b/app_data/migrations/versions/b8243269e9cf_.py
index 5bff90d..dfe8018 100644
--- a/app_data/migrations/versions/b8243269e9cf_.py
+++ b/app_data/migrations/versions/b8243269e9cf_.py
@@ -23,7 +23,7 @@ def upgrade():
                existing_type=mysql.TIMESTAMP(),
                nullable=True,
                existing_server_default=sa.text("'0000-00-00 00:00:00'"))
-    since = datetime.datetime.now() - datetime.timedelta(hours=3)
+    since = datetime.datetime.utcnow() - datetime.timedelta(hours=3)
     for review in db.session.query(Review).all():
         if review.date_deleted == '0000-00-00 00:00:00':
              review.date_deleted = None