using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var datetime1 = new DateTime(2012, 2, 29);

        Console.WriteLine(datetime1);

        var datetime2 = datetime1.ToFullTaiwanDate();

        Console.WriteLine(datetime2);

        var datetime3 = datetime1.ToSimpleTaiwanDate();

        Console.WriteLine(datetime3);

    }

}

​

public static class DateTimeExtensions

{

    /// <summary>

    /// To the full taiwan date.

    /// </summary>

    /// <param name="datetime">The datetime.</param>

    /// <returns></returns>

    public static string ToFullTaiwanDate(this DateTime datetime)

    {

        TaiwanCalendar taiwanCalendar = new TaiwanCalendar();

        return string.Format("民國 {0} 年 {1} 月 {2} 日", 

                             taiwanCalendar.GetYear(datetime),

                             datetime.Month, 

                             datetime.Day);

    }

    /// <summary>

    /// To the simple taiwan date.

    /// </summary>

    /// <param name="datetime">The datetime.</param>

    /// <returns></returns>

    public static string ToSimpleTaiwanDate(this DateTime datetime)

    {

        TaiwanCalendar taiwanCalendar = new TaiwanCalendar();

        return string.Format("{0}/{1}/{2}",

                             taiwanCalendar.GetYear(datetime),

                             datetime.Month,

                             datetime.Day);

    }

}

​