I have date type in SQL nvarchar in sprocedure will it be harmful

I have a table say ABC, in that table i have a field createdDate having datatype date , now i have created an insert proceedure for this table and in createdDate field i created a parameter like this :

@createdDate nvarchar(50)

then when calling this proceedure in c# , i do this :

cmd.Parameters.AddWithValue("@createdDate",DateTime.Now.ToShortDateString());

when record is inserted it shows date like this : 

2014-08-23

will doing these steps be harmful for me in future ? while using SSRS , or when getting data to gridview ... e.t.c ??