How to check database startup time ?

How to check database startup time ?

set pages 9999 lines 300

col open_mode for a10

col host_name for a20

select name db_name,instance_name,host_name,database_role,open_mode,version db_version,logins,

to_char(startup_time,'dd-mon-yyyy hh24:mi:ss') "db up time" from v$database,gv$instance;