add time zone support for sites and users

Oqtane.Client/Extensions/OqtaneServiceCollectionExtensions.cs

@@ -54,6 +54,7 @@ namespace Microsoft.Extensions.DependencyInjection
             services.AddScoped<ILocalizationCookieService, LocalizationCookieService>();
             services.AddScoped<ICookieConsentService, CookieConsentService>();
             services.AddScoped<IOutputCacheService, OutputCacheService>();
+            services.AddScoped<ITimeZoneService, TimeZoneService>();
 
             // providers
             services.AddScoped<ITextEditor, Oqtane.Modules.Controls.QuillJSTextEditor>();