How do I enumerate all time zones in .NET?

Question

I would like to have a list of all the time zones available on a Windows Machine. How can I do this in .NET?

I know about the TimeZoneInfo.GetSystemTimeZones method

Answer 1

If wanting a json output from a WebAPI call:

using System;
using System.Collections.Generic;

namespace MyProject.ViewModels
{
    public class TimeZoneViewModel
    {
        public readonly List CTimeZones;

        public TimeZoneViewModel()
        {
            CTimeZones = new List();
            foreach (TimeZoneInfo z in TimeZoneInfo.GetSystemTimeZones())
            {
                var tz = new CTimeZone(z.Id, z.DisplayName, z.BaseUtcOffset);
                CTimeZones.Add(tz);
            }
        }

    }

    public class CTimeZone
    {
        public string Id { get; set; }
        public string DisplayName { get; set; }
        public TimeSpan BaseUtcOffset { get; set; }

        public CTimeZone(string id, string displayName, TimeSpan utcOffset)
        {
            Id = id;
            DisplayName = displayName;
            BaseUtcOffset = utcOffset;
        }
    }
}

Then use it in WebAPI:

[HttpGet("Api/TimeZones")]
public JsonResult GetTimeZones()
{
    return Json(new TimeZoneViewModel().CTimeZones);
}

Output:

[{
    "id": "Dateline Standard Time",
    "displayName": "(UTC-12:00) International Date Line West",
    "baseUtcOffset": "-12:00:00"
  },
  {
    "id": "UTC-11",
    "displayName": "(UTC-11:00) Coordinated Universal Time-11",
    "baseUtcOffset": "-11:00:00"
  },
  {
    "id": "Aleutian Standard Time",
    "displayName": "(UTC-10:00) Aleutian Islands",
    "baseUtcOffset": "-10:00:00"
  },
  {
    "id": "Hawaiian Standard Time",
    "displayName": "(UTC-10:00) Hawaii",
    "baseUtcOffset": "-10:00:00"
  },...