public static DateTime FirstXDay(this DateTime date, int xday = 1)
{
var firstDay = date.FirstDayOfMonth();
DateTime result = new DateTime();
int count = 0;
for (DateTime day = firstDay; count < 7; day = day.AddDays(1))
{
if (OffDayProvider.IsXday(day, xday))
{
//check if xday is before currentday try for next month
if (day <= date)
{
day = date.AddMonths(1).FirstDayOfMonth().AddDays(-1);
count = 0;
continue;
}
result = day;
break;
}
count++;
}
return(result);
}
public static DateTime NthWeeksXDay(this DateTime date, int xday = 1, int week = 1)
{
var firstDay = date.FirstDayOfMonth();
DateTime nthWeekEnd = new DateTime();
int count = 0;
for (DateTime day = firstDay.AddDays(7 * (week - 1)); count < 7; day = day.AddDays(1))
{
if (OffDayProvider.IsEndOfWeek(day))
{
nthWeekEnd = day;
break;
}
count++;
}
var nthXDay = date.NthXDay(xday, week);
if (nthXDay > nthWeekEnd && week == 1)
{
throw new Exception("NoSuchDateException");
}
else if (nthXDay > nthWeekEnd)
{
nthXDay = nthXDay.AddDays(-7);
}
return(nthXDay);
}
public static DateTime LastXDay(this DateTime date, int xday = 1)
{
var lastDay = date.LastDayOfMonth();
DateTime result = new DateTime();
int count = 0;
for (DateTime day = lastDay; count < 7; day = day.AddDays(-1))
{
if (OffDayProvider.IsXday(day, xday))
{
result = day;
break;
}
count++;
}
return(result);
}
public static DateTime WorkingDay(this DateTime date, bool first = true)
{
var result = new DateTime();
var count = 1;
for (var day = date; count <= 3; day = day.AddDays(first ? 1 : -1))
{
if (!OffDayProvider.IsOffDay(day))
{
result = day;
break;
}
count++;
}
return(result);
}
