private static DateTime GetWorkingDayBefore(DateTime day, int days)
{
if (days < 0)
{
return(GetWorkingDayAfter(day, -days));
}
DayArray dayArray = GetWorkingDays(day.Year);
int index = dayArray.IndexOf(day);
if (index > 0)
{
if (index - days >= 0)
{
return(dayArray[index - days]);
}
return(GetLastYearWorkingDay(day.Year - 1, days - index - 1));//xiaoguohua:return GetLastYearWorkingDay(day.Year - 1, days - index)
}
index = ~index;
if (index == 0)
{
return(GetLastYearWorkingDay(day.Year - 1, days));
}
index--;
if (index - days >= 0)
{
return(dayArray[index - days]);
}
return(GetLastYearWorkingDay(day.Year - 1, days - index - 1));
}
private static int GetWorkingDays(DateTime day1, DateTime day2)
{
if (day1 == day2)
{
return(0);
}
// 算以前的工作日数
if (day2 < day1)
{
return(-GetWorkingDays(day2, day1));
}
DayArray dayArray = GetWorkingDays(day1.Year);
int index0 = dayArray.IndexOf(day1);
if (index0 < 0)
{
index0 = ~index0;
}
// 跨年
if (day2.Year > day1.Year)
{
return(GetNextYearWorkingDays(dayArray.Length - index0 - 1, day1.Year + 1, day2));
}
// 当年
int index1 = dayArray.IndexOf(day2);
if (index1 < 0)
{
index1 = ~index1;
index1--;
}
return(index1 - index0);
}
/// <summary>
/// 获取指定年月节气日期表。
/// </summary>
/// <param name="year">年。</param>
/// <param name="month">月。</param>
/// <returns>返回日期数集合。</returns>
public static int[] GetSolarTeamDays(int year, int month)
{
DayArray dayArray = GetSolarTeamDays(year);
DateTime d1 = dayArray[(month - 1) * 2];
DateTime d2 = dayArray[(month - 1) * 2];
return(new int[] { d1.Day, d2.Day });
}
private static DateTime GetLastYearWorkingDay(int year, int days)
{
DayArray dayArray = GetWorkingDays(year);
if (dayArray.Length - days > 0)
{
return(dayArray[dayArray.Length - days - 1]);
}
return(GetLastYearWorkingDay(year - 1, days - dayArray.Length));
}
private static int GetNextYearWorkingDays(int radix, int year, DateTime day)
{
DayArray dayArray = GetWorkingDays(year);
if (day.Year > year)
{
return(GetNextYearWorkingDays(dayArray.Length + radix, year + 1, day));
}
int index = dayArray.IndexOf(day);
if (index < 0)
{
index = ~index;
return(radix + index);
}
return(radix + index + 1);
}
private static DateTime GetWorkingDayAfter(DateTime day, int days)
{
if (days < 0)
{
return(GetWorkingDayBefore(day, -days));
}
DayArray dayArray = GetWorkingDays(day.Year);
int index = dayArray.IndexOf(day);
if (index < 0)
{
index = ~index;
}
int remains = dayArray.Length - index;
if (days >= remains)
{
// 合理假设：每年元月1日总是非工作日
return(GetWorkingDayAfter(new DateTime(day.Year + 1, 1, 1), days - remains));
}
return(dayArray[index + days]);
}
private DateTime GetSolarTeamDay(int year, int index)
{
DayArray days = GetSolarTeamDays(year);
return(days[index]);
}
