Conversion Between Date Formats

Hi. I have a DB in which we store dates in yyyy/mm/dd. However when we
want to display this date via a web frontend, it needs to be in
dd/mm/yyyy. I've declared a function (shown below) which converts
between these date formats and returns a varchar(20). This works fine
however now I need to have the ability to sort on this date field in
the frontend. This requires my function to return a datetime in the
required format. Can this be done?

DECLARE @InputDate nvarchar(20)
DECLARE @OutputDate nvarchar(20)
DECLARE @Day nvarchar(2)
DECLARE @Month nvarchar(2)
DECLARE @Year nvarchar(4)
DECLARE @Time nvarchar(12)

SET @InputDate = '2005/03/01 14:30:00'
SET @Day = cast(datepart(day,@InputDate) as nvarchar(2))
SET @Month = cast(datepart(month,@InputDate) as nvarchar(2))
SET @Year = cast(datepart(year,@InputDate) as nvarchar(4))
SET @Time = substring(cast(@InputDate as nvarchar(23)),12,12)

SET @OutputDate = replicate('0',2-len(@Day)) + @Day + '/' +
replicate('0',2-len(@Month)) + @Month + '/' +
@Year + ' ' + @Time

SELECT @OutputDate AS OutputDate

Thx
Vilen