How to sort date in mssqlserver

PROBLEM

---

I want to get distinct dates from my dbtable named tblFormno2 in an ascending order.For that i've written the following query but its not working properly.

Column date_submit is declared as datetime

select distinct (convert(nvarchar(100),date_submit,103)) as dob from 
tblFormno2 order by dob asc

Here the the output is shown as

05/07/2011
06/03/2011
06/07/2011
07/04/2011
08/01/2012

instead of

06/03/2011
07/04/2011
05/07/2011
06/07/2011
08/01/2012

How to solve this problem ???

SOLUTION

---

How about

select convert(nvarchar(10), date_submit_inner, 103) as date_submit from 
(
    select distinct date_submit as date_submit_inner from tblFormno2
) as T
order by T.date_submit_inner asc