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();
 }