Oracle Oracle.DataAccess.Client.OracleException ORA-01843: not a valid month

This post shows how to resolve the error “Oracle.DataAccess.Client.OracleException ORA-01843: not a valid month” when using C# to insert or update the data with date. In my below statement I have SS_COMPLETED is a date column. I want to update the current date to the column so I tried.

string strSql = “UPDATE BE_SSIS_FLAG SET SS_FLAG = 1, SS_COMPLETED = ‘” + DateTime.Now.ToString(“dd/MM/yyyy hh:mm:ss”) +“‘”

I got the error below.



Message=ORA-01843: not a valid month

Source=Oracle Data Provider for .NET


at Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, String procedure, Boolean bCheck)

To correctly update the current date time to the datetime column replace ‘” + DateTime.Now.ToString(“dd/MM/yyyy hh:mm:ss”) +“‘ with CURRENT_DATE”.


About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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