网站上显示农历及阳历节日
把阳历日期转换为农历用到的函数为ChinaDate.ConvertToNongLi(DateTime.Now);
得到节日的函数为 ChinaDate.GetFestival(DateTime.Now);
代码：
using System.Globalization;
using System.Collections;
using System;
namespace NetWeb2011.Common
{
public static class ChinaDate
{
private static ChineseLunisolarCalendar china = new ChineseLunisolarCalendar();
private static Hashtable gHoliday = new Hashtable();
private static Hashtable nHoliday = new Hashtable();
private static string[] JQ = { "小寒", "大寒", "立春", "雨水", "惊蛰", "春分", "清明", "谷雨", "立夏", "小满", "芒种", "夏至", "小暑", "大暑", "立秋", "处暑", "白露", "秋分", "寒露", "霜降", "立冬", "小雪", "大雪", "冬至" };
private static int[] JQData = { 0, 21208, 43467, 63836, 85337, 107014, 128867, 150921, 173149, 195551, 218072, 240693, 263343, 285989, 308563, 331033, 353350, 375494, 397447, 419210, 440795, 462224, 483532, 504758 };
static ChinaDate()
{
//公历节日
gHoliday.Add("0101", "元旦");
gHoliday.Add("0214", "情人节");
gHoliday.Add("0305", "雷锋日");
gHoliday.Add("0308", "妇女节");
gHoliday.Add("0312", "植树节");
gHoliday.Add("0315", "消费者权益日");
gHoliday.Add("0401", "愚人节");
gHoliday.Add("0405", "清明节");
gHoliday.Add("0501", "劳动节");
gHoliday.Add("0504", "青年节");
gHoliday.Add("0601", "儿童节");
gHoliday.Add("0701", "建党节");
gHoliday.Add("0801", "建军节");
gHoliday.Add("0910", "教师节");
gHoliday.Add("1001", "国庆节");
gHoliday.Add("1031", "万圣节");
gHoliday.Add("1224", "平安夜");
gHoliday.Add("1225", "圣诞节");
//农历节日
nHoliday.Add("0101", "春节");
nHoliday.Add("0115", "元宵节");
nHoliday.Add("0505", "端午节");
nHoliday.Add("0815", "中秋节");
nHoliday.Add("0909", "重阳节");
nHoliday.Add("1208", "腊八节");
nHoliday.Add("1230", "大年三十");
}
/// <summary>
/// 获取农历
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetChinaDate(DateTime dt)
{
if (dt > china.MaxSupportedDateTime || dt < china.MinSupportedDateTime)
{
//日期范围：1901 年 2 月 19 日 - 2101 年 1 月 28 日
throw new Exception(string.Format("日期超出范围！必须在{0}到{1}之间！", china.MinSupportedDateTime.ToString("yyyy-MM-dd"), china.MaxSupportedDateTime.ToString("yyyy-MM-dd")));
}
string str = string.Format("{0} {1}{2}", GetYear(dt), GetMonth(dt), GetDay(dt));
string strJQ = GetSolarTerm(dt);
if (strJQ != "")
{
str += " (" + strJQ + ")";
}
string[] strHoliday = GetHoliday(dt, 0);
if (strHoliday != null)
{
str += " " + strHoliday;
}
string[] strChinaHoliday = GetChinaHoliday(dt, 0);
if (strChinaHoliday != null)
{
str += " " + strChinaHoliday;
}
return str;
}
/// <summary>
/// 获取农历年份
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetYear(DateTime dt)
{
int yearIndex = china.GetSexagenaryYear(dt);
string yearTG = " 甲乙丙丁戊己庚辛壬癸";
string yearDZ = " 子丑寅卯辰巳午未申酉戌亥";
string yearSX = " 鼠牛虎兔龙蛇马羊猴鸡狗猪";
int year = china.GetYear(dt);
int yTG = china.GetCelestialStem(yearIndex);
int yDZ = china.GetTerrestrialBranch(yearIndex);
string str = string.Format("[{1}]{2}{3}{0}", year, yearSX[yDZ], yearTG[yTG], yearDZ[yDZ]);
return str;
}
/// <summary>
/// 得到公历所对应的农历年
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetChinaYear(DateTime dt)
{
return china.GetYear(dt).ToString();
}
/// <summary>
/// 获取农历月份
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetMonth(DateTime dt)
{
int year = china.GetYear(dt);
int iMonth = china.GetMonth(dt);
int leapMonth = china.GetLeapMonth(year);
bool isLeapMonth = iMonth == leapMonth;
if (leapMonth != 0 && iMonth >= leapMonth)
{
iMonth--;
}
string szText = "正二三四五六七八九十";
string strMonth = isLeapMonth ? "闰" : "";
if (iMonth <= 10)
{
strMonth = "";
strMonth = strMonth + szText.Substring(iMonth - 1, 1);
}
else if (iMonth == 11)
{
strMonth = "十一";
}
else
{
strMonth = "腊";
}
return strMonth + "月";
}
/// <summary>
/// 获取农历日期
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetDay(DateTime dt)
{
int iDay = china.GetDayOfMonth(dt);
string szText1 = "初十廿三";
string szText2 = "一二三四五六七八九十";
string strDay;
if (iDay == 20)
{
strDay = "二十";
}
else if (iDay == 30)
{
strDay = "三十";
}
else
{
strDay = szText1.Substring((iDay - 1) / 10, 1);
strDay = strDay + szText2.Substring((iDay - 1) % 10, 1);
}
return strDay;
}
private static string GetNongLiDay(string str)
{
string ret = string.Empty;
ret += ConvertNongliToDigital(str.Substring(0, 1), 0);
ret += ConvertNongliToDigital(str.Substring(1, 1), 1);
return ret;
}
private static string GetNongLiMonth(string str)
{
string ret = string.Empty;
if (str.Length == 2) //是 十月 还是 十一月
{
ret += ConvertMonthToDigital(str.Substring(0, 1));
ret += ConvertMonthToDigital(str.Substring(1, 1));
}
else if (str.Length == 3)
{
ret += ConvertMonthToDigital(str.Substring(0, 2));
}
return ret;
}
/// <summary>
/// 把汉字月转换成对应的数字
/// </summary>
/// <param name="nonglimonth"></param>
/// <returns></returns>
private static string ConvertMonthToDigital(string nonglimonth)
{
string ret = string.Empty;
switch (nonglimonth)
{
case "一": ret = "1";
break;
case "二": ret = "2";
break;
case "三": ret = "3";
break;
case "四": ret = "4";
break;
case "五": ret = "5";
break;
case "六": ret = "6";
break;
case "七": ret = "7";
break;
case "八": ret = "8";
break;
case "九": ret = "9";
break;
case "十":
ret = "10";
break;
case "十一":
ret = "11";
break;
case "十二":
ret = "12";
break;
case "正":
ret = "1";
break;
case "腊":
ret = "12";
break;
}
return ret;
}
/// <summary>
/// 把汉字日转换成对应的数字，first，是用来区别十这个汉字，是在第一个位置还是在别的位置上
/// </summary>
/// <param name="nongli"></param>
/// <param name="first"></param>
/// <returns></returns>
private static string ConvertNongliToDigital(string nongli, int first)
{
string ret = string.Empty;
switch (nongli)
{
case "一": ret = "1";
break;
case "二": ret = "2";
break;
case "三": ret = "3";
break;
case "四": ret = "4";
break;
case "五": ret = "5";
break;
case "六": ret = "6";
break;
case "七": ret = "7";
break;
case "八": ret = "8";
break;
case "九": ret = "9";
break;
case "十":
if (first == 1)
{
ret = "0";
}
else ret = "1";
break;
case "初": ret = "0";
break;
case "廿": ret = "2";
break;
}
return ret;
}
/// <summary>
/// 获取节气
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetSolarTerm(DateTime dt)
{
DateTime dtBase = new DateTime(1900, 1, 6, 2, 5, 0);
DateTime dtNew;
double num;
int y;
string strReturn = "";
y = dt.Year;
for (int i = 1; i <= 24; i++)
{
num = 525948.76 * (y - 1900) + JQData[i - 1];
dtNew = dtBase.AddMinutes(num);
if (dtNew.DayOfYear == dt.DayOfYear)
{
strReturn = JQ[i - 1];
}
}
return strReturn;
}
/// <summary>
/// 获取公历节日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string[] GetHoliday(DateTime dt, int next) //next为0表示当前月，next为1表示下个月
{
string strReturn = "";
object g = null;
if (next == 0)
{
g = gHoliday[dt.Month.ToString("00") + dt.Day.ToString("00")];
}
if (g != null)
{
strReturn = g.ToString();
return new string[] { dt.Month.ToString("00") + dt.Day.ToString("00"), g.ToString() };
}
else
{
string first = string.Empty;
int day = 0;//当前多少号
if (next == 0)
{
first = dt.Month.ToString("00");
day = dt.Day; //当前多少号
}
else
{
dt = dt.AddMonths(next);
first = dt.Month.ToString("00");
}
day++;
for (int i = day; i <= 31; i++)
{
object festival = gHoliday[first + i.ToString("00")];
if (festival != null)
{
string[] ret = { first + i.ToString("00"), festival.ToString() }; //当前当月的离今天最近的一个节日
return ret;
}
}
}
return null;
}
/// <summary>
/// 获取农历节日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string[] GetChinaHoliday(DateTime dt, int next) //next表示是否是下一个月
{
string strReturn = string.Empty;
int year = china.GetYear(dt);
int iMonth = china.GetMonth(dt);
int leapMonth = china.GetLeapMonth(year);
int iDay = china.GetDayOfMonth(dt);
if (china.GetDayOfYear(dt) == china.GetDaysInYear(year))
{
strReturn = "除夕";
}
else if (leapMonth != iMonth)
{
if (leapMonth != 0 && iMonth >= leapMonth)
{
iMonth--;
}
object n = nHoliday[iMonth.ToString("00") + iDay.ToString("00")];
if (n != null)
{
string[] ret = { iMonth.ToString("00") + iDay.ToString("00"), n.ToString() };
return ret;
}
else //该日期没有节日
{
if (next != 0)
{
iDay = 0;
iMonth += next;
}
for (int i = iDay; i <= 31; i++)
{
object festival = nHoliday[iMonth.ToString("00") + i.ToString("00")];
if (festival != null)
{
string[] ret = { iMonth.ToString("00") + i.ToString("00"), festival.ToString() };
return ret;
}
}
}
}
if (strReturn != string.Empty)
{
return new string[] { "1230", "除夕" };
}
return null;
}
/// <summary>
/// 把阳历转成农历
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static DateTime ConvertToNongLi(DateTime dt)
{
string year = ChinaDate.GetChinaYear(dt);
string month = ChinaDate.GetNongLiMonth(ChinaDate.GetMonth(dt));
string day = ChinaDate.GetNongLiDay(ChinaDate.GetDay(dt));
DateTime dtnongli = DateTime.Parse(year + "-" + month + "-" + day);
return dtnongli;
}
/// <summary>
/// 得到节日，没有节日的话，就返回empty
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetFestival(DateTime dt)
{
try
{
string currentfestival = string.Empty;
string nonglidate = string.Empty;
string gonglidate = string.Empty;
int distance = 0;
int basemonth = 0;
string[] gongli = ChinaDate.GetHoliday(dt, basemonth);//公历节日
string[] nongli = ChinaDate.GetChinaHoliday(dt, basemonth);//农历节日
bool festival = true; //是否这个月内有节日
DateTime dtGongli = dt;
DateTime dtNongli = dt;
if (gongli == null && nongli == null) //如果同时为空，就取下个月的
{
basemonth++;
gongli = ChinaDate.GetHoliday(dt, basemonth);//公历节日
nongli = ChinaDate.GetChinaHoliday(dt, basemonth);//农历节日
}
//dt = dt.AddMonths(basemonth);
if (gongli != null)
{
DateTime riqi = DateTime.Parse(dt.Year.ToString() + "-" + gongli[0].Substring(0, 2) + "-" + gongli[0].Substring(2, 2));
dtGongli = ConvertToNongLi(riqi);
}
if (nongli != null)
{
dtNongli = DateTime.Parse(ChinaDate.GetChinaYear(dt) + "-" + nongli[0].Substring(0, 2) + "-" + nongli[0].Substring(2, 2));
}
System.Text.StringBuilder today = new System.Text.StringBuilder();
//today.Append(DateTime.Now.ToString("yyyy-MM-dd") + " " + DateTime.Now.ToString("ddd", new System.Globalization.CultureInfo("zh-cn")) + " ");
if (gongli != null && nongli != null)
{
TimeSpan ts = dtGongli - dtNongli;
if (ts.Days < 0)// 公历的节日更近 把两个日期都转换成公历进行比较
{
currentfestival = gongli[1];
gonglidate = gongli[0];
TimeSpan tsDay = dtGongli - ConvertToNongLi(dt);
distance = tsDay.Days;
}
else
{
ts = dtNongli - dtGongli;
currentfestival = nongli[1];
TimeSpan tsDay = dtNongli - ConvertToNongLi(dt);
distance = tsDay.Days;
}
}
else if (gongli != null)
{
currentfestival = gongli[1];
DateTime dtfestival = ConvertToNongLi(DateTime.Parse(ChinaDate.GetChinaYear(dt) + "-" + gongli[0].Substring(0, 2) + "-" + gongli[0].Substring(2, 2)));
TimeSpan tsDay = dtfestival - ConvertToNongLi(dt);
distance = tsDay.Days;
}
else if (nongli != null)
{
currentfestival = nongli[1];
distance = int.Parse(nongli[0].Substring(2, 2)) - ConvertToNongLi(dt).Day;
}
else festival = false;
//today.Append("农历" + ChinaDate.GetMonth(dt) + ChinaDate.GetDay(dt));
if (festival)
{
if (distance > 0)
today.Append(" 离<font color='red'>" + currentfestival + "</font>还有<font color='red'>" + distance + "</font>天 ");
else today.Append(" 今天是 <font color='red'>" + currentfestival + "</font> ");
}
//else today.Append(" ");
return today.ToString();
}
catch
{
return string.Empty;
}
}
}
}
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