public PointInTime(IOrdinal ordinal, IDaySelector daySelector)
{
_ordinal = ordinal;
_daySelector = daySelector;
}
public PointInMonth(IOrdinal ordinal, IDaySelector daySelector, IPeriodSelector <MonthPeriod> monthSelector)
{
_ordinal = ordinal;
_daySelector = daySelector;
_monthSelector = monthSelector;
}