農歷日歷C#實現類

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp
{
    /**

ChineseCalendarGB.java
Copyright (c) 1997-2002 by Dr. Herong Yang
中國農歷算法- 實用于公歷1901 年至2100 年之間的200 年
*/
public class CnCalendar
{

static fileds

static methods

private int gregorianYear = 1901;
private int gregorianMonth = 1;
private int gregorianDate = 1;
private bool isGregorianLeap;
private int dayOfYear;

/// <summary>
/// 周日------- 一星期的第一天
/// </summary>
private int dayOfWeek;
private int chineseYear;

/// <summary>
/// 負數表示閏月
/// </summary>
private int chineseMonth;

private int chineseDate;

//24節氣
private int sectionalTerm;
private int principleTerm;

public CnCalendar()
{
    SetGregorian(1901, 1, 1);
}

public void SetGregorian(int y, int m, int d)
{
    gregorianYear = y;
    gregorianMonth = m;
    gregorianDate = d;
    isGregorianLeap = IsGregorianLeapYear(y);
    dayOfYear = DayOfYear(y, m, d);
    dayOfWeek = DayOfWeek(y, m, d);
    chineseYear = 0;
    chineseMonth = 0;
    chineseDate = 0;
    sectionalTerm = 0;
    principleTerm = 0;
}

/// <summary>
/// 根據設定的公歷（陽歷）年月人計算農歷年月日天干地支
/// </summary>
/// <returns>是否得到結果，得到結果為0，否則為1</returns>
public int ComputeChineseFields()
{
    if (gregorianYear < 1901 || gregorianYear > 2100) return 1;
    int startYear = baseYear;
    int startMonth = baseMonth;
    int startDate = baseDate;
    chineseYear = baseChineseYear;
    chineseMonth = baseChineseMonth;
    chineseDate = baseChineseDate;
    // 第二個對應日，用以提高計算效率
    // 公歷2000 年1 月1 日，對應農歷4697 年11 月25 日
    if (gregorianYear >= 2000)
    {
        startYear = baseYear + 99;
        startMonth = 1;
        startDate = 1;
        chineseYear = baseChineseYear + 99;
        chineseMonth = 11;
        chineseDate = 25;
    }
    int daysDiff = 0;
    for (int i = startYear; i < gregorianYear; i++)
    {
        daysDiff += 365;
        if (IsGregorianLeapYear(i)) daysDiff += 1; // leap year
    }
    for (int i = startMonth; i < gregorianMonth; i++)
    {
        daysDiff += DaysInGregorianMonth(gregorianYear, i);
    }
    daysDiff += gregorianDate - startDate;

    chineseDate += daysDiff;
    int lastDate = DaysInChineseMonth(chineseYear, chineseMonth);
    int nextMonth = NextChineseMonth(chineseYear, chineseMonth);
    while (chineseDate > lastDate)
    {
        if (Math.Abs(nextMonth) < Math.Abs(chineseMonth)) chineseYear++;
        chineseMonth = nextMonth;
        chineseDate -= lastDate;
        lastDate = DaysInChineseMonth(chineseYear, chineseMonth);
        nextMonth = NextChineseMonth(chineseYear, chineseMonth);
    }
    return 0;
}

/// <summary>
/// 計算24節氣
/// </summary>
/// <returns></returns>
public int ComputeSolarTerms()
{
    if (gregorianYear < 1901 || gregorianYear > 2100) return 1;
    sectionalTerm = SectionalTerm(gregorianYear, gregorianMonth);
    principleTerm = PrincipleTerm(gregorianYear, gregorianMonth);
    return 0;
}

public override string ToString()
{
    StringBuilder buf = new StringBuilder();
    buf.Append("Gregorian Year: " + gregorianYear + "\n");
    buf.Append("Gregorian Month: " + gregorianMonth + "\n");
    buf.Append("Gregorian Date: " + gregorianDate + "\n");
    buf.Append("Is Leap Year: " + isGregorianLeap + "\n");
    buf.Append("Day of Year: " + dayOfYear + "\n");
    buf.Append("Day of Week: " + dayOfWeek + "\n");
    buf.Append("Chinese Year: " + chineseYear + "\n");
    buf.Append("Heavenly Stem: " + TIANGAN_NAMES[((chineseYear - 1) % 10)] + "\n");
    buf.Append("Earthly Branch: " + DIZHI_NAMES[((chineseYear - 1) % 12)] + "\n");
    buf.Append("Chinese Month: " + chineseMonth + "\n");
    buf.Append("Chinese Date: " + chineseDate + "\n");
    buf.Append("Sectional Term: " + sectionalTerm + "\n");
    buf.Append("Principle Term: " + principleTerm + "\n");
    return buf.ToString();
}

/// <summary>
/// 計算指定日期的明天的農歷
/// </summary>
public void RollUpOneDay()
{
    dayOfWeek = dayOfWeek % 7 + 1;
    dayOfYear++;
    gregorianDate++;
    int days = DaysInGregorianMonth(gregorianYear, gregorianMonth);
    if (gregorianDate > days)
    {
        gregorianDate = 1;
        gregorianMonth++;
        if (gregorianMonth > 12)
        {
            gregorianMonth = 1;
            gregorianYear++;
            dayOfYear = 1;
            isGregorianLeap = IsGregorianLeapYear(gregorianYear);
        }
        sectionalTerm = SectionalTerm(gregorianYear, gregorianMonth);
        principleTerm = PrincipleTerm(gregorianYear, gregorianMonth);
    }
    chineseDate++;
    days = DaysInChineseMonth(chineseYear, chineseMonth);
    if (chineseDate > days)
    {
        chineseDate = 1;
        chineseMonth = NextChineseMonth(chineseYear, chineseMonth);
        if (chineseMonth == 1) chineseYear++;
    }
}

}
}</pre> 

 
 初始化類之后，使用方法ComputeChineseFields()即可獲得農歷相關字段。