SQL Server Portal

Sometimes, we come across a case where we have given one date and we need to calculate multiple dates based on this date. This can be achieved in the earlier versions of the SQL Server (earlier than 2022), but we had to use multiple functions like CONVERT(), DATEADD(), DATEDIFF() etc with lots of complexity.

Fortunately, a new function shipped in SQL Server 2022 namely DATETRUNC() which helps us to achieve this scenario easily.

Compatibility Level:

Your database compatibility level MUST be 160 or higher to use this new function.

 ALTER DATABASE tempdb SET COMPATIBILITY_LEVEL = 160 

First Date of Previous Month

• Old Approach

In the old approach, we have to extract first date of the previous month using multiple functions (CONVERT(), DATEADD(), DATEDIFF()) as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date							  AS [Current Date]
	  , CONVERT(DATE
	  , DATEADD(MONTH
	  , DATEDIFF(MONTH, 0, @Date) -1, 0)) AS [First Date Of Previous Month];
GO
--OUTPUT

• New Approach

In the new approach, we can extract the first date of the previous month using DATETRUNC() & DATEADD() function as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date					 AS [Current Date]
	  , DATEADD(MONTH, -1
	  , DATETRUNC(MONTH, @Date)) AS [First Date Of Previous Month];
GO
--OUTPUT

Last Date of Previous Month

• Old Approach

In the old approach, we have to extract last date of the previous month using multiple functions (CONVERT(), DATEADD(), DATEDIFF()) as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date							   AS [Current Date]
      , CONVERT(DATE
	  , DATEADD(MONTH
	  , DATEDIFF(MONTH, 0, @Date) +0, -1)) AS [Last Date Of Previous Month];
GO
--OUTPUT

• New Approach

In the new approach, we can extract the last date of the previous month using DATETRUNC() & DATEADD() function as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date					 AS [Current Date]
      , DATEADD(DAY, -1
	  , DATETRUNC(MONTH, @Date)) AS [Last Date Of Previous Month];
GO
--OUTPUT

First Date of Current Month

• Old Approach

In the old approach, we have to extract first date of the current month using multiple functions (CONVERT(), DATEADD(), DATEDIFF()) as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date							  AS [Current Date]
	  , CONVERT(DATE
	  , DATEADD(MONTH
	  , DATEDIFF(MONTH, 0, @Date) +0, 0)) AS [First Date Of Current Month];
GO
--OUTPUT

• New Approach

In the new approach, we can extract the first date of the current month using DATETRUNC() function as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date					AS [Current Date]
	  , DATETRUNC(MONTH, @Date) AS [First Date of Current Month];
GO
--OUTPUT

Last Date of Current Month

• Old Approach

In the old approach, we have to extract last date of the current month using multiple functions (CONVERT(), DATEADD(), DATEDIFF()) as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date							   AS [Current Date]
      , CONVERT(DATE
	  , DATEADD(MONTH
	  , DATEDIFF(MONTH, 0, @Date) +1, -1)) AS [Last Date Of Current Month];
GO
--OUTPUT

• New Approach

In the new approach, we can extract the last date of the current month using DATETRUNC() & DATEADD() function as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date					  AS [Current Date]
      , DATEADD(DAY, -1
	  , DATEADD(MONTH, 1
	  , DATETRUNC(MONTH, @Date))) AS [Last Date Of Current Month];
GO
--OUTPUT

First Date of Next Month

• Old Approach

In the old approach, we have to extract first date of the next month using multiple functions (CONVERT(), DATEADD(), DATEDIFF()) as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date							  AS [Current Date]
	  , CONVERT(DATE
	  , DATEADD(MONTH
	  , DATEDIFF(MONTH, 0, @Date) +1, 0)) AS [First Date Of Next Month];
GO
--OUTPUT

• New Approach

In the new approach, we can extract the first date of the next month using DATETRUNC() & DATEADD() function as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date					 AS [Current Date]
	  , DATEADD(MONTH, 1
	  , DATETRUNC(MONTH, @Date)) AS [First Date of Next Month];
GO
--OUTPUT

Last Date of Next Month

• Old Approach

In the old approach, we have to extract last date of the next month using multiple functions (CONVERT(), DATEADD(), DATEDIFF()) as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date							   AS [Current Date]
      , CONVERT(DATE
	  , DATEADD(MONTH
	  , DATEDIFF(MONTH, 0, @Date) +2, -1)) AS [Last Date Of Next Month];
GO
--OUTPUT

• New Approach

In the new approach, we can extract the last date of the next month using DATETRUNC() & DATEADD() function as shown below.

DECLARE @Date DATE;
SET @Date = GETDATE();

SELECT  @Date					  AS [Current Date]
      , DATEADD(DAY, -1
	  , DATEADD(MONTH, 2
	  , DATETRUNC(MONTH, @Date))) AS [Last Date Of Next Month];
GO
--OUTPUT

Conclusion:

We used DATETRUNC() function to achieve it and found it easier & simpler as compared to earlier version of SQL Server.

Read Full Post »