When I review the queue by command atq
$ atq
28 Wed Oct 31 10:23:00 2018
27 Tue Oct 30 21:20:00 2018
25 Tue Oct 30 21:19:00 2018
29 Wed Oct 31 10:42:00 2018
26 Tue Oct 30 21:20:00 2018
20 Tue Oct 30 18:25:00 2018
23 Tue Oct 30 18:28:00 2018
19 Tue Oct 30 15:43:00 2018
21 Tue Oct 30 18:27:00 2018
The yesterday tasks are still pending there
atq lists the user's pending jobs, unless the user is the superuser; in that case, every-
body's jobs are listed;
However, yesterday has gone.
What's the reason atq demonstrate such a outdated list.