adding date timestamp to xp_sendmail procedure

I am trying to figure out how to add a time datestamp to my xp_sendmail procedure:

use master;
go

CREATE PROC pr_sendmail
AS

DECLARE @.DT DATETIME
SET @.DT=GETDATE()

BEGIN

EXEC xp_sendmail @.recipients = 'me@.work.com',
@.message = 'send email from SQL Server Stored Procedure.',
@.copy_recipients = 'me@.work.com',
@.subject = 'Job Started at ', @.DT

END

How do I get this to work? Thanks!@.subject = 'Job Started at ' + cast(getdate() as varchar)

you can also use CONVERT instead of CAST to format the date in various different formats.