Get days of a month in SQL

g_p_l

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3 Feb 2010CPOL

@dt is a datetime valuederive the first of this month, add a month to itthen subtract 1 day to get the last day of this monthselect days_of_month=day( dateadd(d,-1, dateadd(m,1, dateadd(d,1-day(@dt), @dt) ) ) )

@dt is a datetime value

derive the first of this month, add a month to it
then subtract 1 day to get the last day of this month

select days_of_month=day(
        dateadd(d,-1,
            dateadd(m,1,
                dateadd(d,1-day(@dt), @dt)
                )
            )
        )

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