Database uptime and startup time

SELECT 'Hostname : ' || HOST_NAME "Host name",
'Instance Name : ' || INSTANCE_NAME "Instance Name",
'Started At : ' || TO_CHAR(STARTUP_TIME, 'DD-MON-YYYY HH24:MI:SS') "Startup Time",
'Uptime : ' || FLOOR(SYSDATE - STARTUP_TIME) || ' days(s) ' ||
TRUNC(24 *
((SYSDATE - STARTUP_TIME) - TRUNC(SYSDATE - STARTUP_TIME))) ||
' hour(s) ' || MOD(TRUNC(1440 * ((SYSDATE - STARTUP_TIME) -
TRUNC(SYSDATE - STARTUP_TIME))),
60) || ' minute(s) ' ||
MOD(TRUNC(86400 *
((SYSDATE - STARTUP_TIME) - TRUNC(SYSDATE - STARTUP_TIME))),
60) || ' seconds' "Uptime"
FROM V$INSTANCE