/// <summary>
/// 用八字寻找公历时间。
/// </summary>
/// <param name="year">年干支</param>
/// <param name="month">月干支</param>
/// <param name="day">日干支</param>
/// <param name="startYear">开始时间</param>
/// <param name="forward">方向： -1 往以前日子， 1 往后面的日子</param>
/// <returns></returns>
public static DateTime 查找八字(string year, string month, string day, int startYear, 方向 forward)
{
// 看年月是否匹配
GanZhi n = new GanZhi(year);
GanZhi m = new GanZhi(month);
if (n.Gan.起月时(m.Zhi, 柱位.月) != m)
{
throw new ArgumentException($"'{year}'年不存在'{month}'月。");
}
// 开始运算
int yearDiff = CalcYearDiff(new GanZhi(year), startYear, forward);
int monthIndex = m.Zhi.Index == 0 ? 12 : m.Zhi.Index;
startYear += m.Zhi.Index == 1 ? 1 : 0;
// 上下搜索600年
for (int periode = 0; periode < 10; periode++)
{
int f = forward == 方向.顺行 ? 1 : -1;
LnDate lndate = new LnDate(startYear + yearDiff + f * 60 * periode, monthIndex, 1);
while (lndate.JieQiTime == TimeSpan.Zero)
{
lndate = lndate.Add(1);
}
if (lndate.YearGZ != year || lndate.MonthGZ != month)
{
throw new Exception("计算思路有错误！");
}
while (lndate.MonthGZ == month)
{
if (lndate.DayGZ == day)
{
return(lndate.datetime);
}
lndate = lndate.Add(1);
}
}
throw new Exception("六百年内找不到结果！");
}
public static DateTime 查找农历(int year, string yue, string day, bool leap = false)
{
LnDate lndate = new LnDate(year, 1, 1);
while (lndate.Year == year)
{
if (lndate.MonthNL == yue && lndate.DayNL == day && string.IsNullOrEmpty(lndate.Leap) != leap)
{
return(lndate.datetime);
}
lndate = lndate.Add(1);
}
throw new Exception("找不到结果！");
}