public BillingCycle CalculateNext()
{
return(new BillingCycle(
start: this.end,
end: interval.CalculateNext(this.End),
interval: interval
));
}
public static BillingCycle CalculateFirst(DateTime start, Interval interval)
{
return(new BillingCycle(start, end: interval.CalculateNext(start), interval: interval));
}