Difference date format in development environment and server

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ASP.NET

Hi all

I will explain my issue with the help of problem in one report.im using visual studio 2010 and sql server 2008 .In my development system i retrieve the details from database with in a date its working well .In text box im displaying date in dd/mm/yy format

ld_fromdate = Convert.ToDateTime(como.ff_SetDate(txtcreatedfromdate.Text));
public string ff_SetDate(string datetime)
    {
            string[] date = datetime.Split('/');
            string DD = date[0];
            string MM = date[1];
            string YY = date[2];
            string dt = DD +"/"+ MM +"/"+ YY;
            return (dt);
       
    }

when i add this to server its not working instead the below code of conversion is working

public string ff_mm_dd_yy_Date(string strDate)
       {
               string DD, Mm, Yy;
               string[] str = strDate.Split('/');
               DD = str[0];
               Mm = str[1];
               Yy = str[2];
               return ("" + Mm +"/"+ DD +"/"+ Yy + "";);
       }

first one working in development environment secon one working in server.as many other applications hosted in server i cant change system settings .how can i maintain through coding
Thanks in Advance
Amritha