I have a code in SQL that do a lot of stuff and I am testing a part in the end of the procedure

The problem is that there is some variables in the beginning and they're used in the end, I would like to not execute all of the code because it takes some time processing, it seams like this:

--Some variables are created and manipulated

DECLARE @DT DATE
SET @DT = ISNULL(@DT, GETDATE())
DECLARE @DF DATE = EOMONTH(@DT)
      , @DI DATE = DATEADD(DAY, 1, EOMONTH(@DT, -1))
DECLARE @DTI DATETIME = @DI
      , @DTF DATETIME = @DF
SET @DTF += 1

/*
    slow proccess
*/

    --In the end the same variables are reused

SELECT *
FROM SYS.TABLES
WHERE create_date BETWEEN @DTI AND @DTF

I can reuse the declare, like this:

--Some variables are created and manipulated

DECLARE @DT DATE
SET @DT = ISNULL(@DT, GETDATE())
DECLARE @DF DATE = EOMONTH(@DT)
      , @DI DATE = DATEADD(DAY, 1, EOMONTH(@DT, -1))
DECLARE @DTI DATETIME = @DI
      , @DTF DATETIME = @DF
SET @DTF += 1

/*
    slow proccess
*/

    --In the end the same variables are reused

DECLARE @DT DATE
SET @DT = ISNULL(@DT, GETDATE())
DECLARE @DF DATE = EOMONTH(@DT)
      , @DI DATE = DATEADD(DAY, 1, EOMONTH(@DT, -1))
DECLARE @DTI DATETIME = @DI
      , @DTF DATETIME = @DF
SET @DTF += 1

SELECT *
FROM SYS.TABLES
WHERE create_date BETWEEN @DTI AND @DTF

It works, but it is ugly, is there another better way?