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Software

declare 
     @input datetime
    ,@FirstDayThisMonth datetime
    ,@LastDayThisMonth datetime

select
     @input = '1/12/2009'
    ,@FirstDayThisMonth  = dateadd(day, 1-day(@input), @input)
    ,@LastDayThisMonth   = dateadd(day, 0-day(@input), dateadd(month, 1, @input))
;
with a as (
    select 0 as n
    union select 1
    union select 2
    union select 3
    union select 4
    union select 5
    union select 6
    union select 7
    union select 8
    union select 9
    union select 10
    union select 11
    union select 12
    union select 13
    union select 14
    union select 15
    union select 16
    union select 17
    union select 18
    union select 19
    union select 20
    union select 21
    union select 22
    union select 23
    union select 24
    union select 25
    union select 26
    union select 27
    union select 28
    union select 29
    union select 30
    union select 31
    )
,b as (
    select
        result = dateadd(d, a.n, @FirstDayThisMonth)
    from
        a
    )
select
    result
from 
    b
where
    result between @FirstDayThisMonth and @LastDayThisMonth