How to produce localized date string with CultureInfo

You can use the second argument to the toString function and use any language/culture you need...

You can use the "d" format instead of ToShortDateString according to MSDN...

So basically something like this to return as Australian English:

CultureInfo enAU = new CultureInfo("en-AU");
dt.ToString("d", enAU);

you could modify your method to include the language and culture as a parameter

public static string ConvertDateTimeToDate(string dateTimeString, String langCulture) {

    CultureInfo culture = new CultureInfo(langCulture);
    DateTime dt = DateTime.MinValue;

    if (DateTime.TryParse(dateTimeString, out dt))
    {
        return dt.ToString("d",culture);
    }
    return dateTimeString;
  }

Edit
You may also want to look at the overloaded tryParse method if you need to parse the string against a particular language/culture...

Use an overload of ToString() instead of a ToShortDateString() method. Supply an IFormatProvider.

This should be helpful in forming a specific date-time string:

http://www.csharp-examples.net/string-format-datetime/

This should be helpful with localization issues:

How do you handle localization / CultureInfo