You have to format the date and cast it as character.
Not sure how you get the dates to come out of SQL Assistant like that, but the following works fine for me on TD12:

cREATE VOLATILE TABLE T1
(PK smallint not null
, dt date not null)
on commit preserve rows;

insert into t1 values (1,'2008-01-01');
insert into t1 values (2,'2008-04-20');

select PK, Cast((Dt (Format 'mm/dd/yyyy')) as Char(10))
from t1;