怎么把中文日期格式转换成英文格式，例如把2011.8.21转换成August 21, 2011

//2011.8.21转换成August 21, 2011DateTime dt = new DateTime(2011, 8, 21);            string s = dt.ToString("MMMM dd, yyyy", new CultureInfo("en-us"));Console.WriteLine(s);
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http://topic.csdn.net/u/20070718/10/11635955-3ad5-47dd-aeb3-1ab9abecad88.html