Time difference calculation between two dates

SELECT user_name,
             TO_CHAR (creation_date, 'dd-Mon-yyyy hh24:mi:ss') creation_date,
             TRUNC (SYSDATE - creation_date) "Days",
             TRUNC (MOD ( (SYSDATE - creation_date) * 24, 24)) "Hours",
             TRUNC (MOD ( (SYSDATE - creation_date) * 24 * 60, 60)) "Miutes",
             TRUNC (MOD ( (SYSDATE - creation_date) * 24 * 60 * 60, 60)) "Seconds",
             TO_CHAR (SYSDATE, 'dd-Mon-yyyy hh24:mi:ss') AS system_date,
             SYSDATE - creation_date "Total days",
             (SYSDATE - creation_date) * 24 "Total Hours",
             (SYSDATE - creation_date) * 26 * 60 "Total Minutes",
             (SYSDATE - creation_date) * 26 * 60 * 60 "Total Seconds"
  FROM fnd_user;