show date on failure

tests/test_backup.py

@@ -100,7 +100,7 @@ def test_last_backup_is_recent(server: str) -> bool:
             date = datetime.strptime(last, "%Y-%m-%d-%H%M%S")
             # check age
             if (datetime.now() - date).days > MAX_AGE:
-                u.error("older than {} days".format(MAX_AGE))
+                u.error("older than {} days: {}".format(MAX_AGE, date))
                 return False
             u.success("less than {} days old".format(MAX_AGE))
             return True