public QuarterlyInterval(DateTime startDate, int endDay) : base(Period.Quarterly)
{
var endDateAtEndOfQuarter = false;
EndDay = endDay;
if (EndDay == -1 || EndDay >= 90)
{
endDateAtEndOfQuarter = true;
}
int startDateDayOfQuarter = startDate.DayOfQuarter();
if (endDateAtEndOfQuarter)
{
StartDate = startDate.StartOfQuarter();
}
else if (endDay < startDateDayOfQuarter)// past this quarter, move to next
{
StartDate = startDate.AddDays(1 + endDay - startDateDayOfQuarter);
}
else
{
StartDate = startDate.AddDays(-1 - startDateDayOfQuarter).StartOfQuarter().AddDays(endDay);
}
if (endDateAtEndOfQuarter)
{
EndDate = StartDate.EndOfQuarter();
}
else
{
EndDate = StartDate.EndOfQuarter().AddDays(endDay);
}
}