Date

yes I have the sp rule in which it is returning me no of months in terms of days(for ex: 6 months or 12 months in 6 or 12),I need to convert that days (6 days into months) with the date, how i can do this? I need do use sp output only. 

Now you're introducing "days" into the discussion and you have lost me...I don't understand what you're trying to achieve. Can you provide more detail please.

okay sure.  yes I have sp rule which is taking inputs as integer values and giving me output as a integer. so now i am trying to convert those days(6 or 12 or 24 etc) into months and add to date(date may be dd/mm/yy) my code is below

/* this is sp rule*/
a!localVariables(

  local!spResult: fn!executestoredprocedure(
    dataSourceName: cons!DATASOURCE_NAME,
    procedureName: cons!SP_MONTHS,
    inputs: {
      {
        name: "CI",
        value: ri!ci_int,
        
      },
      {
        name: "CODE",
        value: Code_int,
       
      }
    }
  ),
  
  if(
    
    and(
      local!spResult.success,
      not(
        isnull(
          local!spResult.parameters
        )
      )
    ),
    local!spResult.parameters.MONTHS,
    ""
  )
    
    
  )

Am I providing detail?

We still can't understand what you're trying to actually accomplish.  Maybe give an example of the end result you'd expect given a particular stored procedure result (or 2 such examples)?