SQL SELECT * FROM OPENROWSET with Variable

I am trying to pass a variable into a SELECT statement in OPENROWSET but I keep getting an error `DECLARE @dDateTIME DATE

SET @dDateTIME = (SELECT SalesDate FROM dbo.SalesDate)

INSERT INTO dbo.tblSales SELECT * FROM OPENROWSET('MSDASQL', 'dsn=mydsn;uid=myid;pwd=mypwd;', 'SELECT ID, TranDate, ProductID, CostValue, SalesValue, QtySold, FROM tblSales WHERE TranDate='' + @dDateTIME + ''')`