// constructors
/// <summary>
/// Initializes a new instance of the <see cref="Recurrence"/> class.
/// </summary>
/// <param name="dateStart">The date start</param>
/// <param name="interval">The interval</param>
/// <remarks>Use TimeSpan.Zero as interval for non-recurring events.</remarks>
public Recurrence(DateTimeOffset dateStart, TimeSpan interval)
{
this.dateStart = dateStart;
this.dateEnd = DateTimeOffset.MaxValue;
this.interval = interval;
this.excludedHours = HourFlags.None;
this.excludedDayOfWeeks = DayOfWeekFlags.None;
this.excludedDays = DayFlags.None;
this.excludedMonths = MonthFlags.None;
}