The cron task file_temp_cleanup_task checks for files older than 1 week using the relative strtotime('-1 week') method which will account for DST changes.

However, the unit tests for this function determine a week ago using hardcoded 7*24*60*60 instead - which does NOT account for DST. Both of these need to be calculating a week ago in the same way, otherwise for the week following a DST change like we just had this past weekend, the test will fail.