Codelab Blog » Excel http://blog.codelab.co.nz Technical Articles and News from Codelab Ltd Tue, 17 Jan 2012 13:10:43 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Open XML – OLE Automation Date Issues http://blog.codelab.co.nz/2010/07/26/open-xml-ole-automation-date-issues/ http://blog.codelab.co.nz/2010/07/26/open-xml-ole-automation-date-issues/#comments Sun, 25 Jul 2010 12:16:20 +0000 Tim http://blog.codelab.co.nz/?p=290 If you are exporting a date from C# to Excel using 2007, you probably will use the following:

Math.Round(DateTime.Now.ToOADate(), 12).ToString()

This exports the date as a OLE Automation date recognized by Excel 2007. How ever, in Excel 2010 this was causing issues, every time I exported to Excel 2010, it said that it has to repair my document and it never displayed the values correctly as dates.

Because I was using Open XML to generate the markup, Excel 2010 has been support for Open XML. I got around the problem of using:

DateTime.Now.ToString("yyyy-MM-dd'T'HH:mm:ss.fffffffzzz");

This exports the date as a XML Date format.
Hope this helps anyone who has the same problem!

]]> http://blog.codelab.co.nz/2010/07/26/open-xml-ole-automation-date-issues/feed/ 1