Improving work with SQL DataTime

I have a business in my Date. I need change date below

for each date before 25 of each month I want get 25 of month before and for each date after 25 of each month I want get 25 of the same month.

Example :

for 2015/06/24 (or 2015/06/06) I need 2015/05/25

and for 2015/06/25 (or 2015/06/30) I need 2015/06/25

I write this query :

DECLARE @A DATE = '2015/06/01'


SELECT  
    ( CASE WHEN DATEDIFF(MONTH, DATEADD(Day, -25, @A), @A) = 0
           THEN DATEADD(DAY, 25, DATEADD(Day, -DAY(@A), @A))
           ELSE DATEADD(DAY, 25, DATEADD(MONTH, -1, DATEADD(Day, -DAY(@A), @A)))
      END )

But I am looking for better solution.

Best How To :

You can do it like this:

SELECT IIF(DAY(@A) >= 25,
           DATEADD(d, 25 - DAY(@A), @A),
           DATEADD(d, 25, EOMONTH(@A, -2)))

Here's a sample fiddle as well: sqlfiddle

Note: EOMONTH requires SQL Sever 2012 or above - it returns the End-Of-Month date given a start date and a month offset.

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