How to retrieve latest date column comparing with rest of the date columns ??

Hi Friends,
I have 6 Date columns (some of col has Null data)  I need to compare all 6 columns date, how can I produce recent date to
new Column! can you please help me Tsql Code or Function.
Thanks for advance.

Hej 
create table datetest(id int,date1 datetime,date2 datetime,date3 datetime,date4 datetime)
insert into datetest values(1,GETDATE(),GETDATE()-1,GETDATE()-2,GETDATE()-3)
go
SELECT  MAX(date_columns) AS max_dateFROM    ( (SELECT   date1 AS date_columns FROM     datetest         )          UNION          ( SELECT  date2 AS date_columns            FROM    datetest          )          UNION          ( SELECT  date3 AS date_columns            FROM    datetest          )  UNION          ( SELECT  date4 AS date_columns            FROM    datetest          )        ) AS date_query

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