using System;

using System.Collections.Generic;

//using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Start");

        var startTime = DateTime.Now.Date.TimeOfDay.Add(TimeSpan.FromMinutes(10));

        var endTime = startTime.Add(new TimeSpan(22,20,00));

        Console.WriteLine("StartTime={0}", startTime);

        Console.WriteLine("EndTime={0}", endTime);

        Console.WriteLine("Start");

        var intervals = getIntervals(startTime, endTime, 30);

        foreach(var item in intervals)

        {

            Console.WriteLine("{0}", item.ToString());

        }

        Console.WriteLine("End");

    }

    private static IEnumerable<TimeSpan> getIntervals(TimeSpan startTime, TimeSpan endTime, int interval)

    {

        while(startTime <= endTime.Add(TimeSpan.FromMinutes(10)))

        {

            yield return startTime;

            startTime = startTime.Add(TimeSpan.FromMinutes(interval));

        }

            //}while(startTime < endTime);

        //}while(startTime < endTime.Add(TimeSpan.FromMinutes(10)));

    }

}