using System;

public class Program

{

    public static void Main()

    {

        var now = DateTimeOffset.UtcNow;

        Console.WriteLine(now);

​

        var christmasIslands = TimeZoneInfo.FindSystemTimeZoneById("Pacific/Enderbury");

        var hawaii = TimeZoneInfo.FindSystemTimeZoneById("Pacific/Honolulu");

​

        Console.WriteLine("Christmas Islands");

        Console.WriteLine(now.ToDateOnly(christmasIslands));

        Console.WriteLine("Hawaii");

        Console.WriteLine(now.ToDateOnly(hawaii));

    }

}

​

public static class DateOnlyExtensions {

    public static DateTimeOffset ToDateTimeOffset(this DateOnly dateOnly, TimeZoneInfo zone) {

        var dateTime = dateOnly.ToDateTime(new TimeOnly(0));

        return new DateTimeOffset(dateTime, zone.GetUtcOffset(dateTime));

    }

​

    public static DateOnly ToDateOnly(this DateTimeOffset dto, TimeZoneInfo zone) {

        var inTargetZone = TimeZoneInfo.ConvertTime(dto, zone);

​

        return DateOnly.FromDateTime(inTargetZone.Date);

    }

}