C#公历转农历

在.net2.0 的版本中的 System.Globalization.ChineseLunisolarCalendar 是针对中国的日历类，公历与中国传统农历纪年之间的相互转换，利用它可以计算天干地支等有关农历的信息。

使用

static ChineseLunisolarCalendar cCalendar = new ChineseLunisolarCalendar();

cCalendar.MaxSupportedDateTime 返回支持的最大日期，即2101-1-28

cCalendar.MinSupportedDateTime  返回支持的最小日期，即1901－2-19

下面我们来实现公历转农历。

/// <summary>
/// 根据公历获取农历日期
/// </summary>
/// <param name="datetime">公历日期</param>
/// <returns></returns>
public static string GetChineseDateTime(DateTime datetime)
{
    int lyear = cCalendar.GetYear(datetime);
    int lmonth = cCalendar.GetMonth(datetime);
    int lday = cCalendar.GetDayOfMonth(datetime);

    //获取闰月， 0 则表示没有闰月
    int leapMonth = cCalendar.GetLeapMonth(lyear);

    bool isleap = false;

    if (leapMonth > 0)
    {
        if (leapMonth == lmonth)
        {
            //闰月
            isleap = true;
            lmonth--;
        }
        else if (lmonth > leapMonth)
        {
            lmonth--;
        }
    }

    return string.Concat(GetLunisolarYear(lyear), "年", isleap ? "闰" : string.Empty, GetLunisolarMonth(lmonth), "月", GetLunisolarDay(lday));
}

测试的结果:

传入日期：2010-3-4

返回农历：庚寅[虎]年正月十九

可以满足简单的需求啦。

其他代码也附上：

#region 农历年

/// <summary>
/// 十天干
/// </summary>
private static string[] tiangan = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };

/// <summary>
/// 十二地支
/// </summary>
private static string[] dizhi = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };

/// <summary>
/// 十二生肖
/// </summary>
private static string[] shengxiao = { "鼠", "牛", "虎", "免", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };

/// <summary>
/// 返回农历天干地支年 
/// </summary>
/// <param name="year">农历年</param>
/// <returns></returns>
public static string GetLunisolarYear(int year)
{
    if (year > 3)
    {
        int tgIndex = (year - 4) % 10;
        int dzIndex = (year - 4) % 12;

        return string.Concat(tiangan[tgIndex], dizhi[dzIndex], "[", shengxiao[dzIndex], "]");

    }

    throw new ArgumentOutOfRangeException("无效的年份!");
}       

#endregion

#region 农历月

/// <summary>
/// 农历月
/// </summary>
private static string[] months = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二(腊)" };

/// <summary>
/// 返回农历月
/// </summary>
/// <param name="month">月份</param>
/// <returns></returns>
public static string GetLunisolarMonth(int month)
{
    if (month < 13 && month > 0)
    {
        return months[month - 1];
    }

    throw new ArgumentOutOfRangeException("无效的月份!");
}

#endregion

#region 农历日

/// <summary>
/// 
/// </summary>
private static string[] days1 = { "初", "十", "廿", "三" };

/// <summary>
/// 日
/// </summary>
private static string[] days = { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十" };

/// <summary>
/// 返回农历日
/// </summary>
/// <param name="day"></param>
/// <returns></returns>
public static string GetLunisolarDay(int day)
{
    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!");
}

#endregion

还有一个根据日期获取生肖的代码:

/// <summary>
/// 返回生肖
/// </summary>
/// <param name="datetime">公历日期</param>
/// <returns></returns>
public static string GetShengXiao(DateTime datetime)
{
    return shengxiao[cCalendar.GetTerrestrialBranch(cCalendar.GetSexagenaryYear(datetime)) - 1];
}

 source:http://www.cnblogs.com/huxj/archive/2010/03/04/1678160.html

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