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之前的1921年的出错了，又在网上找了一个改了下，没找到原链接，最后出现的格式是：牛年  辛丑  四月十六，有找到的可以放在评论

    class LunDay//当天日期变为阴历{System.Globalization.ChineseLunisolarCalendar ChineseCalendar = new System.Globalization.ChineseLunisolarCalendar();private static string[] tg = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };// 十天干private static string[] dz = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };// 十二地支private static string[] sx = { "鼠", "牛", "虎", "免", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };// 十二生肖private static string[] months = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二(腊)" };// 农历月private static string[] days1 = { "初", "十", "廿", "三" };// 农历日private static string[] days = { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十" };private static string GetLunisolarYear(int year)// 返回农历年{if (year > 3){int tgIndex = (year - 4) % 10;int dzIndex = (year - 4) % 12;return string.Concat(sx[dzIndex],"年","  ",tg[tgIndex], dz[dzIndex] );}throw new ArgumentOutOfRangeException("无效的年份!");}private static string GetLunisolarMonth(int month)// 返回农历月{if (month < 13 && month > 0){return months[month - 1];}throw new ArgumentOutOfRangeException("无效的月份!");}private static string GetLunisolarDay(int day)// 返回农历日{if (day > 0 && day < 32){if (day != 20 && day != 30){return string.Concat(days1[(day - 1) / 10], days[(day - 1) % 10]);}else{return string.Concat(days[(day - 1) / 10], days1[1]);}}throw new ArgumentOutOfRangeException("无效的日!");}public  string GetLunisolarCalendar(DateTime dateTime)// 返回农历日期{bool isleap = false;LunDay lunDay = new LunDay();int year = lunDay.ChineseCalendar.GetYear(dateTime);int month = lunDay.ChineseCalendar.GetMonth(dateTime);int day = lunDay.ChineseCalendar.GetDayOfMonth(dateTime);//获取闰月，0 则表示没有闰月.当之前的月份都闰月存在,则需要当前月份减1int leapMonth = lunDay.ChineseCalendar.GetLeapMonth(year);if (leapMonth > 0){if (leapMonth <= month){if (leapMonth == month){isleap = true;  //农历闰月}   month--;  //月份修正}}return string.Concat(GetLunisolarYear(year),"  ", isleap ? "闰" : string.Empty, GetLunisolarMonth(month), "月", GetLunisolarDay(day));}}
}

调用时

  LunDay lunday = new LunDay();//计算阴历日期label8.Text = lunday.GetLunisolarCalendar(DateTime.Now);