Does BETWEEN with dates actually work in SQL SERVER 2008

Question

According to cdonner, in his answer here and on his blog.

He claims that BETWEEN with date yields inconsistent results

From his blog:

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Answer 1

SQL server stores datetime values as a number. For instance, 0 is 1900-01-01 00:00:00.000

The example you give in your question is subject to rounding problems, similar to how the floating-point value 1.0 is stored as 0.99999...

To accurately compare dates, you would cast the value to a datetime type and then do your comparison.

SELECT
CASE 
    WHEN cast('1/1/08' as datetime) 
        BETWEEN cast('1/1/08' as datetime) AND cast('2/1/08' as datetime) 
    THEN 'in' ELSE 'out' 
END AS s1,
CASE 
    WHEN cast('1/1/08' as datetime) 
        BETWEEN cast('12/31/07' as datetime) AND cast('1/1/08' as datetime) 
    THEN 'in' ELSE 'out' 
END AS s2

Which will result in your expected output: s1==in, s2==in