How to Calculate the Number of Days in a Month in SQL Server?

Determining the Number of Days in a Month in SQL Server

Calculating the number of days in a month is a common task in SQL Server. Whether it's for scheduling, reporting, or financial calculations, there's a need to efficiently determine this value.

Built-in Function

Unlike some other databases, SQL Server does not provide a direct built-in function to determine the number of days in a month. However, there are two functions that can be combined to achieve this result.

User-Defined Function

The following user-defined function leverages the EOMONTH function to get the last day of the month and then utilizes the DAY function to calculate the number of days:

CREATE FUNCTION DaysInMonth (@Date DATETIME)
RETURNS INT
AS
BEGIN
    DECLARE @LastDay DATETIME
    SET @LastDay = EOMONTH(@Date)
    RETURN DAY(@LastDay)
END

Example Usage

To use this function, simply pass a date parameter and it will return the number of days in that month:

DECLARE @ADate DATETIME
SET @ADate = '2023-04-15'
SELECT DaysInMonth(@ADate) AS DaysInApril

This will return the value 30, as April has 30 days.

By combining these functions, SQL Server users can easily and efficiently determine the number of days in any month, regardless of the year or date provided.

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