using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    private class Shift

    {

        public int id {get;set;}

        public DateTime StartDateTime {get;set;}

        public DateTime EndDateTime {get;set;}

    }

​

    private static DateTime GetStartDateTime(DateTime dateTime, int startOfDayHour)

    {

        if (dateTime.Hour < startOfDayHour)

        {

            return new DateTime(dateTime.Year, dateTime.Month, dateTime.Day - 1, startOfDayHour, dateTime.Minute, dateTime.Second);

        }

        else

        {

            return new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, startOfDayHour, dateTime.Minute, dateTime.Second);

        }

    }

​

    public static void Main()

    {

        var shifts = new List<Shift>

        {

            new Shift{StartDateTime = DateTime.Parse("2022-06-07 22:00"), EndDateTime = DateTime.Parse("2022-06-08 04:00"), id=1},

            new Shift{StartDateTime = DateTime.Parse("2022-06-07 22:00"), EndDateTime = DateTime.Parse("2022-06-08 06:00"), id=2}

        };

        var startOfDayHour = 5; 

        var startDateTime = GetStartDateTime(shifts[0].StartDateTime, startOfDayHour);

        var endDateTime = startDateTime.AddDays(1);

        Console.WriteLine("startDateTime = {0:yyyy-MM-dd hh:mm} endDateTime = {1:yyyy-MM-dd hh:mm}", startDateTime, endDateTime);

​

        var shifts2 = shifts.Where(s => s.StartDateTime >= startDateTime && s.EndDateTime <= endDateTime && s.id == 1);

        Console.WriteLine("{0}",shifts2.Count()>0);

        var shifts3 = shifts.Where(s => s.StartDateTime >= startDateTime && s.EndDateTime <= endDateTime && s.id == 2);

        Console.WriteLine("{0}",shifts3.Count()>0);

    }

}