FIX: Incorrect result when you run a query that uses the TRY_CONVERT function together with the style parameter in SQL Server 2012

Symptoms

Assume that you run a query that uses the TRY_CONVERT function together with the style parameter in Microsoft SQL Server 2012. In this situation, the style parameter may be ignored and the query may return an incorrect result.

Resolution

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

To reproduce this issue, follow these steps:

1. Create a table in SQL Server 2012 SP1 named "Test," and insert a record in to the table:
   
   CREATE TABLE TEST (I DATE);
   
   INSERT INTO TEST VALUES (GETDATE());
   

2. Run the following queries to return a correct result:
   
   
   SELECT TOP 1 TRY_CONVERT(VARCHAR, TRY_CONVERT(DATE, '20121023'), 112) FROM TEST;
   
   SELECT CONVERT(VARCHAR, TRY_CONVERT(DATE, '20121023'), 112) FROM TEST;
   
   SELECT CONVERT(VARCHAR, CONVERT(DATE, '20121023'), 112) FROM TEST;
   
   SELECT TRY_CONVERT(VARCHAR, '20121023', 112) FROM TEST;
   
   --The returned result is "20121023".

3. Then, run the following queries to return an incorrect result:
   
   
   SELECT TRY_CONVERT(VARCHAR, TRY_CONVERT(DATE, '20121023'), 112) FROM TEST;
   
   SELECT TRY_CONVERT(VARCHAR, CONVERT(DATE, '20121023'), 112) FROM TEST;
   
   --The returned result is "2012-10-23".
   
   

References

For more information about the TRY_CONVERT(Transact-SQL) function, go to the follow MSDN website:

General information about the TRY_CONVERT(Transact-SQL) function

For more information the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:

935897 An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problems For more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:

822499 Naming schema for Microsoft SQL Server software update packages For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates