/// <summary>
/// This is used to expand the yearly frequency by hour
/// </summary>
/// <param name="r">A reference to the recurrence</param>
/// <param name="dates">A reference to the collection of current instances that have been generated</param>
/// <returns>The number of instances in the collection. If zero, subsequent rules don't have to be
/// checked as there's nothing else to do.</returns>
public int ByHour(Recurrence r, RecurDateTimeCollection dates)
{
return(Expand.ByHour(r, dates));
}
