using System;

using TimeZoneConverter;

public class Program

{

    public static void Main()

    {

        var utcNow = DateTime.UtcNow;

        Console.WriteLine(utcNow);

        var timeZoneId = "Europe/Kaliningrad";

        var timeZone = TZConvert.GetTimeZoneInfo(timeZoneId);

        Console.WriteLine(timeZone.Id);

​

        var localTime = TimeZoneInfo.ConvertTimeFromUtc(utcNow, timeZone);

        Console.WriteLine(localTime);

​

        var localMidnight = localTime.Date;

        Console.WriteLine(localMidnight);

​

        var utcMidnight = TimeZoneInfo.ConvertTimeToUtc(localMidnight, timeZone);

        Console.WriteLine(utcMidnight);

​

        var storeMinutesOffset = 60 * (utcNow.Hour + timeZone.BaseUtcOffset.Hours) + (utcNow.Minute + timeZone.BaseUtcOffset.Minutes);

        var storeCurrentDateTime = utcNow.AddMinutes(storeMinutesOffset);

        var result = new DateTime(storeCurrentDateTime.Year, storeCurrentDateTime.Month, storeCurrentDateTime.Day, 0, 0, 0);

        Console.WriteLine(result);

    }

}