C# 将系统时间转换成农历时间

直接上代码：
  1 using System;
  2 using System.Collections.Generic;
  3 using System.Text;
  4 
  5 namespace RSMISClient
  6 {
  7     using System.Globalization;
  8     public static class ChineseDate
  9     {
 10         private static ChineseLunisolarCalendar cCalendar = new ChineseLunisolarCalendar();
 11         //cCalendar.MaxSupportedDateTime 返回支持的最大日期，即2101-1-28
 12         //cCalendar.MinSupportedDateTime  返回支持的最小日期，即1901－2-19
 13 
 14         #region 农历年
 15         /// <summary>
 16         /// 十天干
 17         /// </summary>
 18         private static string[] tiangan = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };
 19 
 20         /// <summary>
 21         /// 十二地支
 22         /// </summary>
 23         private static string[] dizhi = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };
 24 
 25         /// <summary>
 26         /// 十二生肖
 27         /// </summary>
 28         private static string[] shengxiao = { "鼠", "牛", "虎", "免", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };
 29 
 30         /// <summary>
 31         /// 返回农历天干地支年 
 32         /// </summary>
 33         /// <param name="year">农历年</param>
 34         /// <returns></returns>
 35         public static string GetLunisolarYear(int year)
 36         {
 37             if (year > 3)
 38             {
 39                 int tgIndex = (year - 4) % 10;
 40                 int dzIndex = (year - 4) % 12;
 41 
 42                 return string.Concat(tiangan[tgIndex], dizhi[dzIndex], "[", shengxiao[dzIndex], "]");
 43             }
 44 
 45             throw new ArgumentOutOfRangeException("无效的年份!");
 46         }
 47         #endregion
 48 
 49         #region 农历月
 50         /// <summary>
 51         /// 农历月
 52         /// </summary>
 53         private static string[] months = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一(冬)", "十二(腊)" };
 54 
 55         /// <summary>
 56         /// 返回农历月
 57         /// </summary>
 58         /// <param name="month">月份</param>
 59         /// <returns></returns>
 60         public static string GetLunisolarMonth(int month)
 61         {
 62             if (month < 13 && month > 0)
 63             {
 64                 return months[month - 1];
 65             }
 66 
 67             throw new ArgumentOutOfRangeException("无效的月份!");
 68         }
 69         #endregion
 70 
 71         #region 农历日
 72         /// <summary>
 73         /// 
 74         /// </summary>
 75         private static string[] days1 = { "初", "十", "廿", "三" };
 76 
 77         /// <summary>
 78         /// 日
 79         /// </summary>
 80         private static string[] days = { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十" };
 81 
 82         /// <summary>
 83         /// 返回农历日
 84         /// </summary>
 85         /// <param name="day"></param>
 86         /// <returns></returns>
 87         public static string GetLunisolarDay(int day)
 88         {
 89             if (day > 0 && day < 32)
 90             {
 91                 if (day != 20 && day != 30)
 92                 {
 93                     return string.Concat(days1[(day - 1) / 10], days[(day - 1) % 10]);
 94                 }
 95                 else
 96                 {
 97                     return string.Concat(days[(day - 1) / 10], days1[1]);
 98                 }
 99             }
100 
101             throw new ArgumentOutOfRangeException("无效的日!");
102         }
103         #endregion
104 
105         #region 方法
106         public static string GetChineseDateTime(DateTime datetime)
107         {
108             int lyear = cCalendar.GetYear(datetime);
109             int lmonth = cCalendar.GetMonth(datetime);
110             int lday = cCalendar.GetDayOfMonth(datetime);
111 
112             //获取闰月， 0 则表示没有闰月
113             int leapMonth = cCalendar.GetLeapMonth(lyear);
114             bool isleap = false;
115 
116             if (leapMonth > 0)
117             {
118                 if (leapMonth == lmonth)
119                 {
120                     //闰月
121                     isleap = true;
122                     lmonth--;
123                 }
124                 else if (lmonth > leapMonth)
125                 {
126                     lmonth--;
127                 }
128             }
129 
130             return string.Concat(GetLunisolarYear(lyear), "年 ", isleap ? "闰" : string.Empty, GetLunisolarMonth(lmonth), "月·", GetLunisolarDay(lday));
131         }
132         #endregion
133     }
134 
135 }