Date Different in Seconds

select a.*, to_char(a.created_dt,'dd/mm/yyyy hh:mi:ss') as start_dt,

to_char(a.updated_dt,'dd/mm/yyyy hh:mi:ss') as finish_dt,

round((a.updated_dt - a.created_dt) * 24 * 60 * 60,1) as seconds

from progress_bar_Status a

order by a.created_dt;