Search notes:

Oracle: DBMS_UTILITY.GET_TIME

dbms_utility.get_time returns a value of a counter that is increased 100 times per seconds.

The value 0 seems to be somewhat related to the startup time of the instance:

select
   startup_time,
   sysdate - ( dbms_utility.get_time / 100 / 86400 )
from
   v$instance
;

See also