how can i get records from two tables

Hi,
I have two tables
1.Application
column in application are like,
applicationNo,userno,Offerno,Email,Mobile,departme nt

2.Offer
Columns in offer are offerno,startdate,enddate,offertype,offerdesc

Now,I want all application
WHERE offer'startdate is greater than current date and Application's userno='1'


I tried like

ALTER PROCEDURE ERS_SP_GetAvailableApplicationByapplicant
-- Add the parameters for the stored procedure here
@ApplicantID nvarchar(50),
@CurrentDate nvarchar(15)
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here

SELECT * FROM
Application a
INNER JOIN Offer o
ON a.OfferNo=o.OfferNo
WHERE a.ApplicantNo='1'
AND o.SubmissionStartDate >=@CurrentDate

where SubmissionStartDate datatype as well nvarchar(15)

have taken because we save date in arabic

as number like '14311212'

and parameter value will be also in same format

regards
ASIF

So what is the problem?