Add balzor UI.

modules/setting-management/src/Volo.Abp.SettingManagement.Blazor/Pages/SettingManagement/TimeZoneSettingGroup/TimeZoneSettingGroupViewComponent.razor

@@ -0,0 +1,27 @@
+@using Volo.Abp.SettingManagement.Localization
+@inherits Volo.Abp.AspNetCore.Components.AbpComponentBase
+@inject AbpBlazorMessageLocalizerHelper<AbpSettingManagementResource> LH
+
+@if (TimezoneSettings != null)
+{
+    <Form>
+        <Row>
+            <Column>
+                 <Field>
+                     <FieldLabel>@L["DisplayName:Timezone"] *</FieldLabel>
+                     <Select TValue="string" SelectedValue="TimezoneSettings.Timezone" SelectedValueChanged="OnSelectedValueChangedAsync">
+                         @foreach (var item in TimezoneSettings.TimeZoneItems)
+                         {
+                             <SelectItem Value="item.Value">@item.Name</SelectItem>
+                         }
+                     </Select>
+                 </Field>
+            </Column>
+        </Row>
+        <Row>
+            <Column>
+                <SubmitButton Clicked="@UpdateSettingsAsync"/>
+            </Column>
+        </Row>
+    </Form>
+}

modules/setting-management/src/Volo.Abp.SettingManagement.Blazor/Pages/SettingManagement/TimeZoneSettingGroup/TimeZoneSettingGroupViewComponent.razor.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Components;
+using Volo.Abp.AspNetCore.Components.Messages;
+using Volo.Abp.AspNetCore.Components.Web.Configuration;
+using Volo.Abp.SettingManagement.Localization;
+
+namespace Volo.Abp.SettingManagement.Blazor.Pages.SettingManagement.TimeZoneSettingGroup;
+
+public partial class TimeZoneSettingGroupViewComponent
+{
+    [Inject]
+    protected ITimeZoneSettingsAppService TimeZoneSettingsAppService { get; set; }
+
+    [Inject]
+    private ICurrentApplicationConfigurationCacheResetService CurrentApplicationConfigurationCacheResetService { get; set; }
+
+    [Inject]
+    protected IUiMessageService UiMessageService { get; set; }
+
+    protected UpdateTimezoneSettingsViewModel TimezoneSettings;
+
+    public TimeZoneSettingGroupViewComponent()
+    {
+        ObjectMapperContext = typeof(AbpSettingManagementBlazorModule);
+        LocalizationResource = typeof(AbpSettingManagementResource);
+    }
+
+    protected async override Task OnInitializedAsync()
+    {
+        TimezoneSettings = new UpdateTimezoneSettingsViewModel()
+        {
+            Timezone = await TimeZoneSettingsAppService.GetAsync(),
+            TimeZoneItems = await TimeZoneSettingsAppService.GetTimezonesAsync()
+        };
+    }
+
+    protected virtual async Task OnSelectedValueChangedAsync(string timezone)
+    {
+        TimezoneSettings.Timezone = timezone;
+        await InvokeAsync(StateHasChanged);
+    }
+
+    protected virtual async Task UpdateSettingsAsync()
+    {
+        try
+        {
+            await TimeZoneSettingsAppService.UpdateAsync(TimezoneSettings.Timezone);
+            await CurrentApplicationConfigurationCacheResetService.ResetAsync();
+            await UiMessageService.Success(L["SuccessfullySaved"]);
+        }
+        catch (Exception ex)
+        {
+            await HandleErrorAsync(ex);
+        }
+    }
+
+    public class UpdateTimezoneSettingsViewModel
+    {
+        public string Timezone { get; set; }
+
+        public List<NameValue> TimeZoneItems { get; set; }
+    }
+}

modules/setting-management/src/Volo.Abp.SettingManagement.Blazor/Settings/EmailingPageContributor.cs

@@ -5,7 +5,9 @@ using Microsoft.Extensions.Localization;
 using Volo.Abp.Features;
 using Volo.Abp.MultiTenancy;
 using Volo.Abp.SettingManagement.Blazor.Pages.SettingManagement.EmailSettingGroup;
+using Volo.Abp.SettingManagement.Blazor.Pages.SettingManagement.TimeZoneSettingGroup;
 using Volo.Abp.SettingManagement.Localization;
+using Volo.Abp.Timing;
 
 namespace Volo.Abp.SettingManagement.Blazor.Settings;
 
@@ -26,6 +28,17 @@ public class EmailingPageContributor : ISettingComponentContributor
                 typeof(EmailSettingGroupViewComponent)
             )
         );
+
+        if (context.ServiceProvider.GetRequiredService<IClock>().SupportsMultipleTimezone)
+        {
+            context.Groups.Add(
+                new SettingComponentGroup(
+                    "Volo.Abp.TimeZone",
+                    l["Menu:TimeZone"],
+                    typeof(TimeZoneSettingGroupViewComponent)
+                )
+            );
+        }
     }
 
     public async Task<bool> CheckPermissionsAsync(SettingComponentCreationContext context)

modules/setting-management/src/Volo.Abp.SettingManagement.Web/Settings/EmailingPageContributor.cs

@@ -29,7 +29,7 @@ public class EmailingPageContributor : SettingPageContributorBase
             )
         );
 
-        if (!context.ServiceProvider.GetRequiredService<IClock>().SupportsMultipleTimezone)
+        if (context.ServiceProvider.GetRequiredService<IClock>().SupportsMultipleTimezone)
         {
             context.Groups.Add(
                 new SettingPageGroup(