Oracle 21c

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CREATE  OR REPLACE FUNCTION datediff (p_from timestamp, p_to timestamp)
return varchar2 is
  l_years    PLS_INTEGER;
  l_from     TIMESTAMP;
  l_interval interval day(3) to second(6);
begin
  l_years    := TRUNC(MONTHS_BETWEEN(p_to, p_from)/12);
  l_from     := CAST(TRUNC(ADD_MONTHS(p_from, l_years * 12), 'MI') AS TIMESTAMP)
                  + NUMTODSINTERVAL( EXTRACT(SECOND FROM p_from), 'SECOND' );
  l_interval := (p_to - l_from) DAY(3) TO SECOND(6);
  return l_years || ' Years '
    || extract (day from l_interval) || ' Days '
    || extract (hour from l_interval) || ' Hours '
    || extract (minute from l_interval) || ' Minutes '
    || extract (second from l_interval) || ' Seconds';
end datediff;
/
SELECT datediff(
         TO_DATE('1981-04-01 10:11:13','YYYY-MM-DD HH24:MI:SS'), 
         TO_DATE('2022-04-03 17:48:09','YYYY-MM-DD HH24:MI:SS')
       ) as diff
FROM   DUAL;


DIFF


41 Years 2 Days 7 Hours 36 Minutes 56 Seconds


SELECT datediff(
         TIMESTAMP '1981-04-01 10:11:13.551000000',
         TIMESTAMP '2022-04-03 17:48:09.878700000'
       ) as  diff
FROM   DUAL;


DIFF


41 Years 2 Days 7 Hours 36 Minutes 56.3277 Seconds