localize time zone names

Oqtane.Client/Services/Interfaces/ITimeZoneService.cs

@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+using Oqtane.Models;
+
+namespace Oqtane.Services
+{
+    /// <summary>
+    /// Service to retrieve <see cref="TimeZone"/> entries
+    /// </summary>
+    public interface ITimeZoneService
+    {
+        /// <summary>
+        /// Get the list of time zones
+        /// </summary>
+        /// <returns></returns>
+        List<TimeZone> GetTimeZones();
+    }
+}

Oqtane.Client/Services/TimeZoneService.cs

@@ -0,0 +1,34 @@
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.Extensions.Localization;
+using Oqtane.Documentation;
+using Oqtane.Models;
+using Oqtane.Shared;
+
+namespace Oqtane.Services
+{
+    [PrivateApi("Don't show in the documentation, as everything should use the Interface")]
+    public class TimeZoneService : ITimeZoneService
+    {
+        private readonly IStringLocalizer<TimeZoneResources> _TimeZoneLocalizer;
+
+        public TimeZoneService(IStringLocalizer<TimeZoneResources> TimeZoneLocalizer)
+        {
+            _TimeZoneLocalizer = TimeZoneLocalizer;
+        }
+
+        public List<TimeZone> GetTimeZones()
+        {
+            var _timezones = new List<TimeZone>();
+            foreach (var timezone in Utilities.GetTimeZones())
+            {
+                _timezones.Add(new TimeZone
+                {
+                    Id = timezone.Id,
+                    DisplayName = _TimeZoneLocalizer[timezone.Id]
+                });
+            }
+            return _timezones.OrderBy(item => item.DisplayName).ToList();
+        }
+    }
+}