$ set entry <job entry number> /after="new run time"
eg.
1. to set to run 30 seconds from now
$ set entry <job number> /after=" 00:00:30"
2. to run tomorrow at 03:00 am
$ set entry <job number> /after="tomorrow 03:00:00"
3. to run at specific date/time
$ set entry <job number> /after="dd-Mmm-yyyy hh:mm:ss"