CODEWITHSUNDEEP
sqlsql-serversql-server-2008nvarcharsmalldatetime
UCDA2919
UCDA2919

Reputation: 1

SQL Server 2008 : issues with date conversion

I'm currently updating our database system in which the date field is in nvarchar (20), however I have changed this into smalldatetime. In doing so though, certain dates are changing from 11/12/2014-------> 12/11/2014 

Old Date  ------------------------ New Date
11/12/2014------------------------ 2014-11-12 00:00:00.000
12 December 2014------------------ 2014-12-12 00:00:00.000
15/12/2014------------------------ 2014-12-15 00:00:00.000
15/12/2014------------------------ 2014-12-15 00:00:00.000
15 December 2014------------------ 2014-12-15 00:00:00.000
15/12/2014------------------------ 2014-12-15 00:00:00.000
15/12/2014------------------------ 2014-12-15 00:00:00.000
15/12/2014------------------------ 2014-12-15 00:00:00.000
16 December 2014------------------ 2014-12-16 00:00:00.000
16 December 2014------------------ 2014-12-16 00:00:00.000

The following is the code which i am using;

WITH CreateDt1
AS
(
SELECT '14 DEC 12' AS OriginalDate
UNION ALL
SELECT '13/10/2005'
UNION ALL
SELECT '12/14/2012'
UNION ALL
SELECT '24/04/2006 17:17:19' 
UNION ALL
SELECT '28/02/2011'
)
SELECT CreateDt1,
CASE WHEN ISDATE(CreateDt1) = 1
    THEN CAST(CreateDt1 AS datetime)
    ELSE 
        CASE WHEN SUBSTRING(CreateDt1, 3, 1) = '/'
        THEN 
            CASE WHEN ISDATE(SUBSTRING(CreateDt1, 4, 2) + '/' + LEFT(CreateDt1, 2) + '/' + RIGHT (CreateDt1, 4)) = 1
                THEN CAST(SUBSTRING(CreateDt1, 4, 2) + '/' + LEFT(CreateDt1 , 2) + '/' + RIGHT (CreateDt1, 4) AS datetime)
                WHEN ISDATE(SUBSTRING(CreateDt1, 4, 2) + '/' + LEFT(CreateDt1, 2) + '/' + RIGHT (LEFT(CreateDt1,10), 4)) = 1
                THEN CAST(SUBSTRING(CreateDt1, 4, 2) + '/' + LEFT(CreateDt1 , 2) + '/' + RIGHT (LEFT(CreateDt1,10), 4) AS datetime)
            END

        END
    END AS NewDate
FROM fct_Project;

Is there any way in which this can altered?

Upvotes: 0

Views: 109

Answers (1)

UnhandledExcepSean
UnhandledExcepSean

Reputation: 12804

Get your data consistent, then apply casting/conversions.

DECLARE @dates TABLE (
    DateString VARCHAR(50)
    ,[Date] DATE
)
INSERT INTO @dates (DateString) SELECT '11/12/2014'
INSERT INTO @dates (DateString) SELECT '12 December 2014'
INSERT INTO @dates (DateString) SELECT '15/12/2014'


UPDATE @dates
SET [Date]=
    CONVERT(DATE,
        REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(DateString,
            ' January ','/01/'),
            ' February ','/02/'),
            ' March ','/03/'),
            ' April ','/04/'),
            ' May ','/05/'),
            ' June ','/06/'),
            ' July ','/07/'),
            ' August ','/08/'),
            ' September ','/09/'),
            ' October ','/10/'),
            ' November ','/11/'),
            ' December ','/12/')
    ,103)

SELECT * FROM @dates

Upvotes: 0

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