sql server - User defined function sql, Incorrect syntax near the keyword 'return' -

i'm trying write function takes input of date, , calculates difference between current day , inputed date, returns integer of days. (so if input yesterday 2015-5-8 returns 1). far i'm getting error , can't figure out what's wrong. appreciated.

create function dnevnarazlika (@odkdaj nvarchar(15)) returns int  begin  declare @return int select @return = datediff(day,@odkdaj, convert(date,getdate())) end return @return  end 

edit: using microsoft sql management studio

too ends. try below code

create function dnevnarazlika ( @odkdaj nvarchar(15) ) returns int      begin          declare @return int         select  @return = datediff(day, @odkdaj, convert(date, getdate()))         return @return      end