public static DateTime GetPreviousWorkingDay(DateTime date)
{
do
{
date = date.AddDays(-1);
}while (!CalendarCache.IsWorkingDay(date));
return(date);
}
public static List <DateTime> GenerateDateList(DateTime first, DateTime endDate,
int timeSpan, TimeSpanUnit timeSpanUnit, TemplateTimeType dateType, bool isForward, bool ignoreReduplicateDays)
{
if (timeSpan < 1)
{
throw new ApplicationException("Time span can't be 0");
}
var dateList = new List <DateTime>();
DateTime date = first;
for (int i = 0; ; ++i)
{
//避免每个月日期数不同导致的的向下取整问题
//e.g.
//(20160131).AddMonths(1).AddMonths(1) = 20160329
//(20160131).AddMonths(2) = 20160331
var interval = timeSpan * i;
switch (timeSpanUnit)
{
case TimeSpanUnit.Year:
date = first.AddYears(interval);
break;
case TimeSpanUnit.Month:
date = first.AddMonths(interval);
break;
case TimeSpanUnit.Day:
date = first.AddDays(interval);
break;
}
if (dateType == TemplateTimeType.TradingDay && !CalendarCache.IsTradingDay(date))
{
date = isForward ? GetPreviousTradingDay(date) : GetNextTradingDay(date);
}
else if (dateType == TemplateTimeType.WorkingDay && !CalendarCache.IsWorkingDay(date))
{
date = isForward ? GetPreviousWorkingDay(date) : GetNextWorkingDay(date);
}
if (date > endDate)
{
break;
}
bool isIgnore = false;
isIgnore = ignoreReduplicateDays && dateList.Contains(date);
if (!isIgnore)
{
dateList.Add(date);
}
}
return(dateList);
}
private static DateTime AddWorkingDays(this DateTime date, int nDays)
{
bool isAdd = nDays > 0;
bool isSub = nDays < 0;
var begin = date;
var end = date;
int nWorkingDay = 0;
do
{
int nDeltaDay = Math.Abs(nDays) - nWorkingDay;
if (isAdd)
{
end = end.AddDays(nDeltaDay);
}
else if (isSub)
{
begin = begin.AddDays(0 - nDeltaDay);
}
// For example: t-1 -> (endDate - beginData).workdays = 2
var n = CalendarCache.NumOfWorkingDay(begin, end);
if (isAdd)
{
n -= CalendarCache.IsWorkingDay(begin) ? 1 : 0;
}
else if (isSub)
{
n -= CalendarCache.IsWorkingDay(end) ? 1 : 0;
}
nWorkingDay = n;
}while (nWorkingDay < Math.Abs(nDays));
return(nDays > 0 ? end : begin);
}