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I need to determine the number of days in a month for a given date in SQL Server.

Is there a built-in function? If not, what should I use as a user-defined function?

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Try using the below code for the first day of the specified month:

datediff(day, @date, dateadd(month, 1, @date))

Code given below will work for every date:

datediff(day, dateadd(day, 1-day(@date), @date),

              dateadd(month, 1, dateadd(day, 1-day(@date), @date)))

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