query for first and last day of month

Question

If I have the name of the month, how can I have the first and last day of that month in SQL?

I have this query to returns the month names:

DECLARE @StartDate  DATETIME,
        @EndDate    DATETIME;

SELECT   @StartDate = '20110501'        
        ,@EndDate   = '20110801';


SELECT  DATENAME(MONTH, DATEADD(MONTH, x.number, @StartDate)) AS MonthName
FROM    master.dbo.spt_values x
WHERE   x.type = 'P'        
AND     x.number <= DATEDIFF(MONTH, @StartDate, @EndDate)

Result:

Now, how can i get the first and last day of that months? changing the query.

Answer 1

If you want a more general and simple solution:

DECLARE @startdate AS DATETIME = GETDATE()
SELECT      
DATEADD(MONTH, DATEDIFF(MONTH, 0, @startdate) , 0)   as startMonth,
DATEADD(SECOND, -1, DATEADD(MONTH, 1,  DATEADD(MONTH, DATEDIFF(MONTH, 0, @startdate) , 0) ) ) as endMonth

Gives the result:

startMonth              endMonth
----------------------- -----------------------
2013-06-01 00:00:00.000 2013-06-30 23:59:59.000

Answer 2

Try this :-

DECLARE @StartDate  DATETIME,
        @EndDate    DATETIME;

SELECT   @StartDate = '20110501'        
        ,@EndDate   = '20110801';


SELECT  DATENAME(MONTH, DATEADD(MONTH, x.number, @StartDate)) AS MonthName,
CONVERT(VARCHAR(25),
DATEADD(dd,-(DAY(DATEADD(MONTH, x.number, @StartDate))-1),DATEADD(MONTH, x.number, @StartDate)),101) as FirstDay,
CONVERT(VARCHAR(25),DATEADD(dd,-(DAY(DATEADD(mm,1,DATEADD(MONTH, x.number, @StartDate)))),DATEADD(mm,1,DATEADD(MONTH, x.number, @StartDate))),101) as LastDay
FROM    master..spt_values x
WHERE   x.type = 'P'        
AND     x.number <= DATEDIFF(MONTH, @StartDate, @EndDate)

Result :-

 MonthName       FirstDay         LastDay   
  May           05/01/2011        05/31/2011    
 June           06/01/2011        06/30/2011    
 July           07/01/2011        07/31/2011    
 August         08/01/2011        08/31/2011    

Result obtained taking the help from this query

Answer 3

This code gives you the first date of Current Month:

DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0)

If you know the Month's number then:

SELECT      DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()) + @MonthNumber, 0)

Same goes for Month's end date :

SELECT   DATEADD(MILLISECOND, -1,
         DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()) - @@MonthNumber+ 1, 0))

Answer 4

Depending on the version of SQL Server you use, you might also be able to use EOMONTH()... I wrote a guide that breaks down the options in various flavors of SQL here: How to Find the Last Day of the Month in SQL, MySQL, PostgreSQL, and Teradata

Answer 5

Here is a very good article about using the EOMonth function in SQLServer that is has a lot of good example and it is laid out in an easy to read format.

https://www.tutorialsrack.com/articles/60/how-to-get-first-and-last-day-of-a-month-in-sql-server-using-eomonth-function