C#公历与日本和历之间的转化

static void Main(string[] args)
{
{//公历 转为 日本和历
CultureInfo ci = new CultureInfo("ja-JP");
Calendar cal = new JapaneseCalendar();
ci.DateTimeFormat.Calendar = cal;
string strDate = "2011/07/24";
DateTime dt = DateTime.Parse(strDate);
string strJpDate = dt.ToString("ggyy/MM/dd", ci);
Console.WriteLine("{0} = {1}", strDate, strJpDate); // output: 平成23/07/24
}
{//公历 转为 日本和历简写
CultureInfo ci = new CultureInfo("ja-JP");
Calendar cal = new JapaneseCalendar();
ci.DateTimeFormat.Calendar = cal;
string strDate = "2011/07/24";
DateTime dt = DateTime.Parse(strDate);
string strJpDate = ci.DateTimeFormat.GetAbbreviatedEraName(cal.GetEra(dt)) + dt.ToString("yy/MM/dd", ci);
Console.WriteLine("{0} = {1}", strDate, strJpDate); // output: 平18/09/26
}
{//公历 转为 日本和历英文简写
CultureInfo ci = new CultureInfo("ja-JP");
Calendar cal = new JapaneseCalendar();
ci.DateTimeFormat.Calendar = cal;
string strDate = "2011/07/24";
DateTime dt = DateTime.Parse(strDate);
Type t = typeof(DateTimeFormatInfo);
PropertyInfo pi = t.GetProperty("AbbreviatedEnglishEraNames", BindingFlags.NonPublic | BindingFlags.Instance);
string[] engEras = (string[])pi.GetValue(ci.DateTimeFormat, null);
int era = cal.GetEra(dt);
string strJpDate = engEras[era - 1] + dt.ToString("yy/MM/dd", ci);
Console.WriteLine("{0} = {1}", strDate, strJpDate); // output: H18/09/26
}

{//日本和历 转为 公历
CultureInfo ci = new CultureInfo("ja-JP");
Calendar cal = new JapaneseCalendar();
ci.DateTimeFormat.Calendar = cal;
string strJpDate = "平成23/07/24";
string strDate = DateTime.ParseExact(strJpDate, "ggyy/MM/dd", ci).ToString("yyyy/MM/dd");
Console.WriteLine("{0} = {1}", strJpDate, strDate);  // output: 2011/07/24
}
{//日本和历简写 转为 公历
CultureInfo ci = new CultureInfo("ja-JP");
Calendar cal = new JapaneseCalendar();
ci.DateTimeFormat.Calendar = cal;
string strJpDate = "平23/07/24";
string strDate = DateTime.ParseExact(strJpDate, "ggyy/MM/dd", ci).ToString("yyyy/MM/dd");
Console.WriteLine("{0}   = {1}", strJpDate, strDate);  // output: 2011/07/24
}

Console.ReadKey();
}