Tuesday, September 24, 2013

SQL datetime formatting function–convert to string

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I found this looking for something else on the Internet, but I thought it would be a great item for your toolbox. The function was originally written for 2005, but it has worked on everything I’ve tried.
Enjoy!
Many thanks to Anubhav Goyal , who provided this information to the SQL community on June 11, 2009  - You rock Anubhav! http://anubhavg.wordpress.com/2009/06/11/how-to-format-datetime-date-in-sql-server-2005/
/*-------------------------------------------------------------------------------------------*/
--SQL Server date formatting function --convert datetime to string
/*--------------------------------------------------------------------------------------------*/

--SQL datetime functions
--SQL Server date formats
--T-SQL convert dates
--Formatting dates sql server

CREATE FUNCTION dbo.fnFormatDate (@Datetime DATETIME, @FormatMask VARCHAR(32))
RETURNS VARCHAR(32)
AS
BEGIN
    DECLARE @StringDate VARCHAR(32)
    SET @StringDate = @FormatMask
    IF (CHARINDEX ('YYYY',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'YYYY',
                         DATENAME(YY, @Datetime))
    IF (CHARINDEX ('YY',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'YY',
                         RIGHT(DATENAME(YY, @Datetime),2))
    IF (CHARINDEX ('Month',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'Month',
                         DATENAME(MM, @Datetime))
    IF (CHARINDEX ('MON',@StringDate COLLATE SQL_Latin1_General_CP1_CS_AS)>0)
       SET @StringDate = REPLACE(@StringDate, 'MON',
                         LEFT(UPPER(DATENAME(MM, @Datetime)),3))
    IF (CHARINDEX ('Mon',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'Mon',
                                     LEFT(DATENAME(MM, @Datetime),3))
    IF (CHARINDEX ('MM',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'MM',
                  RIGHT('0'+CONVERT(VARCHAR,DATEPART(MM, @Datetime)),2))
    IF (CHARINDEX ('M',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'M',
                         CONVERT(VARCHAR,DATEPART(MM, @Datetime)))
    IF (CHARINDEX ('DD',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'DD',
                         RIGHT('0'+DATENAME(DD, @Datetime),2))
    IF (CHARINDEX ('D',@StringDate) > 0)
       SET @StringDate = REPLACE(@StringDate, 'D',
                                     DATENAME(DD, @Datetime))  
RETURN @StringDate
END
GO

--Microsoft SQL Server date format function test
--MSSQL formatting dates

SELECT dbo.fnFormatDate (getdate(), 'MM/DD/YYYY')           --01/03/2012
SELECT dbo.fnFormatDate (getdate(), 'DD/MM/YYYY')           --03/01/2012
SELECT dbo.fnFormatDate (getdate(), 'M/DD/YYYY')            --1/03/2012
SELECT dbo.fnFormatDate (getdate(), 'M/D/YYYY')             --1/3/2012
SELECT dbo.fnFormatDate (getdate(), 'M/D/YY')               --1/3/12
SELECT dbo.fnFormatDate (getdate(), 'MM/DD/YY')             --01/03/12
SELECT dbo.fnFormatDate (getdate(), 'MON DD, YYYY')         --JAN 03, 2012
SELECT dbo.fnFormatDate (getdate(), 'Mon DD, YYYY')         --Jan 03, 2012
SELECT dbo.fnFormatDate (getdate(), 'Month DD, YYYY')       --January 03, 2012
SELECT dbo.fnFormatDate (getdate(), 'YYYY/MM/DD')           --2012/01/03
SELECT dbo.fnFormatDate (getdate(), 'YYYYMMDD')             --20120103
SELECT dbo.fnFormatDate (getdate(), 'YYYY-MM-DD')           --2012-01-03

--CURRENT_TIMESTAMP returns current system date and time in standard internal format
SELECT dbo.fnFormatDate (CURRENT_TIMESTAMP,'YY.MM.DD')      --12.01.03
GO

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