Fun with TimeZoneInfo

README.md

See it on sharplab.

output.txt

in=11/1/2019 10:00:00 AM -05:00 local=11/1/2019 3:00:00 PM central=11/1/2019 10:00:00 AM eastern=11/1/2019 11:00:00 AM
in=11/5/2019 10:00:00 AM -06:00 local=11/5/2019 4:00:00 PM central=11/5/2019 10:00:00 AM eastern=11/5/2019 11:00:00 AM
in=11/1/2019 10:00:00 AM -04:00 local=11/1/2019 2:00:00 PM central=11/1/2019 9:00:00 AM eastern=11/1/2019 10:00:00 AM

TimeZoneInfoFun.cs

using System;
using System.Linq;
public static class Program {
    public static void Main() {
        var zCentral = TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time");
        var zEastern = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
        foreach (var dto in new (int y, int m, int d, int h, double off)[]{
            (2019, 11, 1, 10, -5),
            (2019, 11, 5, 10, -6),
            (2019, 11, 1, 10, -4),
        }.Select(x=>new DateTimeOffset(x.y, x.m, x.d, x.h, 0, 0, TimeSpan.FromHours(x.off)))) {
            var utcDt = dto.ToUniversalTime().DateTime;
            // Note that local when run in sharplab.io is based on the server’s
            // timezone which is hardcoded to UTC for this particular site.
            Console.WriteLine($"in={dto} local={dto.LocalDateTime} central={TimeZoneInfo.ConvertTimeFromUtc(utcDt, zCentral)} eastern={TimeZoneInfo.ConvertTimeFromUtc(utcDt, zEastern)}");
        }
    }
}