Oracle Scheduler times

trunc on a date field without additional parameters sets the time portion to zeros.

24 hours in a day.  2/24 is 2AM.

You can see that with:

select 
   to_char(trunc(sysdate +1) +2/24,'MM/DD/YYYY HH24:MI:SS'), 
   to_char(sysdate,'MM/DD/YYYY HH24:MI:SS') 
from dual;

Also, when you mention scheduler, that implies dbms_scheduler.  That doesn't use that type of dates anymore.  Those are reserved for the old dbms_job.

If you aren't using dbms_scheduler, you should be.  It is much easier to control run times.