如何在mysql中使用datediff与max

Question

select * from (
         SELECT 
         object_id,created,
         max(created) as Created_date,
         max(closed) as Closed_date,
         max(est_duedate) as Due_date,
         FROM report_tbl p GROUP BY  object_id)A where Location like 
         '%Hubli%'
         and created  BETWEEN '2018-12-01' AND '2018-12-31';

在上面的查询中，如何在max（）中使用datediff来获取日期之间的差异