Create Procedure proc1
  @p1 int =1,
  @p2 int =1
AS
Select * from table
where date1 >= DATEADD(Day, DATEDIFF(Day, 0, getdate()-1), 0)
and date1 < DATEADD(Day, DATEDIFF(Day, 0, getdate()), 0)
and (col1 = @p1 or @p1=1 )
AND (col2 = @p2 or @p2=1)