TSQL - Get the lower of two given integer numbers

/*

       -- Execution

       select dbo.getLowestInt( '201201', '201112' );

       select dbo.getLowestInt( '201201', null );

       select dbo.getLowestInt( null, '201201' );

       select dbo.getLowestInt( null, null );

*/

ALTER function [dbo].[getLowestInt](

       @date1 int

       , @date2 int

)

returns int

as

begin

       return(

              case

                     when isnull(@date1,0) <= isnull(@date2,0)

                     then @date1

                     else @date2

              end

       );

end

;