Getting Nth conjugative records from the table in sql server

I have EMP table in that I am storing the employee salary. Employees are not getting fixed salary each month.  We have requirements like get the previous 2 records and next 2 records form the EMP table when they get the salary 18k.

For example if a employee get the 18k sal in May so we need to get the records of this employee March, April , May , June and July (previous 2 records and next 2 records).

See the table structure

CREATE TABLE [dbo].[Emp](                 [EmpID] [int] NULL,                 [EmpName] [nvarchar](50) NULL,                 [EmpAdd] [nvarchar](50) NULL,                 [Dept] [nvarchar](50) NULL,                 [Sal] [int] NULL,                 [Date] [date] NULL )

Now I am inserting some records

insert into emp values (3,'Jay','Chennai','SE',12000,'1/31/2016')   insert into emp values (3,'Jay','Chennai','SE',16000,'2/29/2016')   insert into emp values (3,'Jay','Chennai','SE',18000,'3/31/2016')   insert into emp values (3,'Jay','Chennai','SE',13000,'4/30/2016')   insert into emp values (3,'Jay','Chennai','SE',11000,'5/31/2016')   insert into emp values (3,'Jay','Chennai','SE',12800,'6/30/2016')   insert into emp values (3,'Jay','Chennai','SE',13089,'7/31/2016')   insert into emp values (3,'Jay','Chennai','SE',12998,'8/31/2016')   insert into emp values (3,'Jay','Chennai','SE',15455,'9/30/2016')   insert into emp values (3,'Jay','Chennai','SE',14555,'10/31/2016')   insert into emp values (3,'Jay','Chennai','SE',15455,'11/30/2016')   insert into emp values (3,'Jay','Chennai','SE',17034,'12/31/2016')

I have inserted some more records for 3 employees.

select * from emp where sal=18000

For example EmpId =1 is getting 18k salary on April. Our requirement is to get the previous 2 records and next 2 records (erg.  Feb, March, April, May and June).

We can get the desirer output using below sql script

WITH CET_FinalResult    AS (select em.EmpID,DATEPART(MM,em.Date) as curMonth from emp em where sal=18000) , SecondCTE    AS (    select e.EmpID,e.EmpName,e.EmpAdd,e.Dept,e.Sal,e.Date from emp e    inner join CET_FinalResult CR on CR.EmpID=e.EmpID    and DATEPART(MM,e.Date) in (CR.curMonth-2,CR.curMonth-1, CR.curMonth,CR.curMonth+1,CR.curMonth+2)      ) SELECT *   FROM SecondCTE

See the output below

  

Get the desires output.

Thanks!