using System;

public class Program

{

    public static void Main()

    {

        DateTime startDate = new DateTime(2023, 05, 09, 00, 00, 00);  

        Console.WriteLine("new DateTime: {0}",startDate);

        DateTime now = DateTime.Now;  

        Console.WriteLine("DateTime.Now: {0}",now);

        DateTime Utc_now = DateTime.UtcNow;  

        Console.WriteLine("DateTime.UtcNow : {0}",Utc_now);

        var date_time_local = new DateTime(2023, 05, 10, 16, 42, 55, DateTimeKind.Local);

        Console.WriteLine("new DateTime with DateTimeKind.Local: {0}",date_time_local);

        var date_time_utc = new DateTime(2023, 05, 10, 16, 42, 55, DateTimeKind.Utc);

        Console.WriteLine("utcDateTime: {0}",date_time_utc);

        TimeSpan interval = now - startDate;  

        Console.WriteLine("TimeSpan : now - startDate: {0}",interval);

        Console.WriteLine("TimeSpan TotalMilliseconds between today - yesterday: {0}",interval.TotalMilliseconds);

        Console.WriteLine("now to universaltime in TotalMilliseconds: {0}",now.ToUniversalTime());

        long milliseconds_start = DateTimeOffset.Now.AddDays(-5).ToUnixTimeMilliseconds();

        long milliseconds_stop =  DateTimeOffset.Now.ToUnixTimeMilliseconds();

        Console.WriteLine("DateTimeOffset.Now to milliseconds_start: {0}",milliseconds_start);

        Console.WriteLine("DateTimeOffset.Now to milliseconds_stop: {0}",milliseconds_stop);

        var dto = new DateTimeOffset(utcDateTime).ToOffset(TimeSpan.FromHours(2));

        Console.WriteLine("DateTimeOffset(utcDateTime).ToOffset(TimeSpan.FromHours(2)): {0}",dto);

        //var trendyolEpochTimestampInMilliseconds = new DateTimeOffset().ToUnixTimeSeconds();

        //Console.WriteLine(trendyolEpochTimestampInMilliseconds);

    }

}