datetime error in iis 7

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C#

ASP.NET

I have screen in c# asp.net webapplication, where i add news on particular dates.And can edit those dates also.It workes in my local sytem.But shows datetime error when it was running in iis 7 server(Used sql database).And i knew that the short date and long date format in server was different from local system.So i changed date format in local system same as in iis.But still it is working properly.Code i used is shown below:


string stringDate="19/11/2012";
DateTime date = Convert.ToDateTime(ff_SetDate(stringDate));


public string ff_SetDate(string datetime)
{

try
{
string[] date = datetime.Split('/');
string DD = date[0];
string MM = date[1];
string YY = date[2];
string dt = DD + "/" + MM + "/" + YY;
return (dt);
}
catch (Exception ex)
{

throw ex;
}
}