基于ASP.NET实现日期转为大写的汉字

//年份转换为大写汉字
  public static string numtoUpper(int num)
   {
    return "零壹贰叁肆伍陆柒捌玖"[num].ToString();
   }

//月份转换大写汉字
  public static string monthtoUpper(int month)
  {
   if (month < 10)
   {
    return numtoUpper(month);
   }
   else
   {
    if (month == 10) { return "壹拾"; }

    else
    {
     return "壹拾" + numtoUpper(month - 10);
    }
   }
  }


//日期转化为大写汉字
  public static string daytoUpper(int day)
  {
   if (day < 20)
   {
    return monthtoUpper(day);
   }
   else
   {
    String str = day.ToString();
    if (str[1] == '0')
    {
     return numtoUpper(Convert.ToInt16(str[0].ToString())) + "拾";
    }
    else
    {
     return numtoUpper(Convert.ToInt16(str[0].ToString())) + "拾"
      + numtoUpper(Convert.ToInt16(str[1].ToString()));
    }
   }
  }

static void Main(string[] args)
  {
   string year = "2013";
   string retur = string.Empty;
   for (int i = 0; i < year.Length; i++)
   {
    retur += numtoUpper(int.Parse(year[i].ToString())).ToString();
   }
   Console.WriteLine(retur + " 年");
   retur = string.Empty;
   string month = "12";
   retur = monthtoUpper(Convert.ToInt32(month));
   Console.WriteLine(retur + " 月");
   string day = "3";
   retur = daytoUpper(Convert.ToInt32(day));
   Console.WriteLine(retur + " 日");
   Console.ReadLine();
  }