How Can I Get the Number of Days in a Month Using SQL Server?

Determining the Number of Days in a Month with SQL Server

When working with date values in SQL Server, it can be useful to determine the number of days in a given month. This information can be valuable for various applications, such as calculating employee pay or generating reports.

While SQL Server does not provide a built-in function specifically designed to retrieve the number of days in a month, there are several approaches we can consider.

Using EOMONTH and DAY Functions

Introduced in SQL Server 2012, the EOMONTH function returns the last day of a month for a given date. By combining this function with the DAY function, which returns the day of the month, we can determine the total number of days in the month:

DECLARE @ADate DATETIME

SET @ADate = GETDATE()

SELECT DAY(EOMONTH(@ADate)) AS DaysInMonth

This approach first stores the current date in a variable @ADate. GETDATE() is used to obtain the system's current date and time. Then, EOMONTH(@ADate) calculates the last day of the month for the current date, and DAY returns the day of the month from that result, providing the number of days in the current month.

This method is simple and efficient, and it is the preferred approach for SQL Server versions 2012 and later.

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