Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Troubleshooting
Research
Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

Convert European dd/mm/yyyy values to US mm/dd/yyyy

Avatar of Jim Horn
Jim HornFlag for United States of America asked on
Microsoft SQL Server
5 Comments1 Solution740 ViewsLast Modified:
Hi all

My current client is a travel agency that is running 2008R2, which means TRY_CAST and TRY_CONVERT are not available.

I have an SSIS process where I receive .csv's from multiple countries that have a matching file spec, a date column stored as a varchar(10), but the value can be either dd/mm/yyyy or mm/dd/yyyy depending on the country.

Question:  What's the most easy/graceful way to convert from dd/mm/yyyy or mm/dd/yyyy ?

Right now I'm using the below function which conditionally parses the string to YYYYMMDD, but I'm guessing this can be improved.

CREATE FUNCTION dbo.fnConvertEuropeanDateToUS (@dt varchar(10), @CountryCode char(2)) 
RETURNS date 
AS 

begin

-- Convert European dates dd/mm/yyyy to YYYYMMDD

-- TESTING ONLY
-- Declare @dt varchar(10) = '25/05/2016'

Declare @dt_new varchar(12), @ret date

-- Strip out the /'s and -'s
SET @dt = REPLACE(REPLACE(@dt, '-', ''), '/', '') 

IF @CountryCode = 'AU' OR @CountryCode = 'DK' OR @CountryCode = 'EE'
   begin
	
   -- DATES in dd/mm/yyyy format, eg May 25th = '25/05/2016'.  Create a YYYYMMDD value
   SELECT @dt_new = right(@dt,4) + substring(@dt,3,2) + LEFT(@dt,2)
   IF ISDATE(@dt_new) = 1
      SET @ret = CAST(@dt_new as DATE)
   ELSE
      SET @ret = NULL
	
   end
ELSE
   begin
   -- DATES in mm/dd/yyyy format, eg May 25th = '05/25/2016'.  Create a YYYYMMDD value
   SELECT @dt_new = right(@dt,4) + LEFT(@dt,2) + substring(@dt,3,2) 
   IF ISDATE(@dt_new) = 1 
      SET @ret = CAST(@dt_new as DATE)
   ELSE
      SET @ret = NULL
	
   end
RETURN @ret
END
GO

Function calls
SELECT dbo.fnConvertEuropeanDateToUS ('25/05/2016', 'EE') -- good
SELECT dbo.fnConvertEuropeanDateToUS ('05/25/2016', 'EE') -- not good, returns NULL
SELECT dbo.fnConvertEuropeanDateToUS ('25/05/2016', 'US') -- not good, returns NULL
SELECT dbo.fnConvertEuropeanDateToUS ('05/25/2016', 'US') -- good

Thanks.
Jim