Problem parsing dates in .xsd

[Uncle Leo]

I created an OleDbDataAdapter with the wizard in Visual Studio 2003.
It created a dataset, connectionstring etc. for me to work with. It
also created a .xsd file where one of the columns type is set to date.
My program is being used in many different countries, and many
different local settings. Some time ago a user from Turkey contacted
me saying my program crashed on his system with the following error
code:

System.ArgumentException: The string was not recognized as a valid
DateTime. There is a unknown word starting at index 0.Couldn't store
<Ekim 2006in Date By Month Column. Expected type is DateTime.

I checked and double checked my code, but couldn't find what was
causing this error. I installed my program on a Turkish friend's
computer and it ran just fine. As a final effort, I changed the
columns type from date to string, handled the parsing of dates myself
in code, and the error was gone.

Could someone please explain why the parsing in my code works, but not
in the .xsd file? And what is the preferred method to use here. I'm
feeling a bit reluctant in changing code that works just fine for 99%
of my users to accomodate just this one.