how to select first 15 days and last 15 days of every month

Hi team,

how to select first 15 days and last 15 days of every month of the year dynamically in sql server.

e.g

DECLARE @Month INTEGER

DECLARE @Year INTEGER

declare @midofmonth DATETIME

DECLARE @FirstDayOfMonth DATETIME

DECLARE @LastDayOfMonth DATETIME

DECLARE @16DayOfMonth DATETIME

DECLARE @Date1 datetime

SET @Year = YEAR(GETDATE())

SET @FirstDayOfMonth = dateadd(month, @month - 1, dateadd(year, @year - 1900, 0))

SET @Month = month(@FirstDayOfMonth)

SET @LastDayOfMonth = dateadd(month, @month, dateadd(year, @year - 1900, -1))

set @midofmonth=dateadd(month, 7, dateadd(year, @year - 1900, -17))

set @16DayOfMonth=Dateadd(d,16-DATEPART(d,getdate()),GETDATE())