using System;

using System.Text.Json;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        DateTime dt = DateTime.Now.AddHours(5).AddMinutes(30);

        Console.WriteLine(dt);

        dt = dt.Date;

        Console.WriteLine(DateTime.Now);

        Console.WriteLine(dt);

​

        Console.WriteLine(DateOnly.FromDateTime(dt));

        Console.WriteLine(GetNow(dt));

        Console.WriteLine(GetNow(dt.AddHours(23).AddMinutes(59).AddSeconds((59))));

​

        MyClass1 c1 = new ();

        c1.OfficeDays = (Days) 6;

        Console.WriteLine(c1.OfficeDays & Days.Sunday);

        Console.WriteLine(c1.OfficeDays & Days.Monday);

        Console.WriteLine(c1.OfficeDays & Days.Tuesday);

        Console.WriteLine(JsonSerializer.Serialize(c1));

    }

    public static int GetNow(DateTime dt)

        {

            TimeSpan t = (dt - new DateTime(1970, 1, 1));

            return (int)t.TotalSeconds;

        }

    public static DateTime GetDateTimeFromEpoch(long dt)

        {

​

            DateTime epochDateTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

            return epochDateTime.AddSeconds(Convert.ToDouble(dt + 10800));

        }

}

​

public enum Days

{

    Sunday = 1,

    Monday = 2,

    Tuesday = 4

}

public class MyClass1

{

    public int a {get;set;}

    public string b {get;set;}

    public Days OfficeDays {get;set;}

}