using System;

using System.Linq;

using System.Collections.Generic;

using Ical.Net;

using Ical.Net.DataTypes;

using Ical.Net.CalendarComponents;

public class Program

{

    public static void Main()

    {

        var now = DateTime.Parse("2021-09-16T10:00:00");

        var later = now.AddHours(1);

​

        //Repeat daily for 5 days

        var rrule = new RecurrencePattern(FrequencyType.Daily, 1) { Count = 5 };

​

        var e = new CalendarEvent

        {

            Start = new CalDateTime(now),

            End = new CalDateTime(later),

            RecurrenceRules = new List<RecurrencePattern> { rrule },

        };

​

        var calendar = new Calendar();

        calendar.Events.Add(e);

​

        var startSearch = new CalDateTime(DateTime.Parse("2021-09-16T00:00:00"));

        var endSearch = new CalDateTime(DateTime.Parse("2021-09-21T23:59:59"));

        var startTimes = calendar.GetOccurrences(startSearch, endSearch).Select(x => x.Period.StartTime.AsDateTimeOffset);

        startTimes.Dump();

    }

}