Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("zh-cn");
DateTime dt = Convert.ToDateTime("2013-12-2 20:20:22");

Console.WriteLine("当前语言：" + Thread.CurrentThread.CurrentCulture.DisplayName);
Console.WriteLine("日期：2013-12-2 20:20:22");
Console.WriteLine("d-短日期模式:  " + dt.ToString("d", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("D-长日期模式:  " + dt.ToString("D", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("f-完整日期/时间模式（短时间）:  " + dt.ToString("f", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("F-完整日期/时间模式（长时间）:  " + dt.ToString("F", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("g-常规日期/时间模式（短时间）:  " + dt.ToString("g", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("G-常规日期/时间模式（长时间）:  " + dt.ToString("G", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("m-月日模式（m）:  " + dt.ToString("m", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("M-月日模式（M）:  " + dt.ToString("M", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("o-往返日期/时间模式:  " + dt.ToString("o", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("R-RFC1123 模式:  " + dt.ToString("R", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("s-可排序的日期/时间模式；符合 ISO 8601:  " + dt.ToString("s", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("t-短时间模式:  " + dt.ToString("t", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("T-长时间模式:  " + dt.ToString("T", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("u-通用的可排序日期/时间模式:  " + dt.ToString("u", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("U-通用的可排序日期/时间模式:  " + dt.ToString("U", Thread.CurrentThread.CurrentCulture));
Console.WriteLine("Y-年月模式:  " + dt.ToString("Y", Thread.CurrentThread.CurrentCulture));

Console.WriteLine(dt.ToString("yyyyMMdd"));
Console.ReadLine();