diff --git a/apps/admin/e2e/albums-governance.spec.ts b/apps/admin/e2e/albums-governance.spec.ts
index d7729bb..3445d7a 100644
--- a/apps/admin/e2e/albums-governance.spec.ts
+++ b/apps/admin/e2e/albums-governance.spec.ts
@@ -23,7 +23,7 @@ async function createAlbumViaUi(page: Page): Promise<string> {
   await page.getByTestId('album-form-title-zh-CN').fill(`E2E治理相册 ${suffix}`)
   await page.getByRole('tab', { name: '英文' }).click()
   await page.getByTestId('album-form-title-en').fill(`E2E Gov Album ${suffix}`)
-  await page.getByTestId('album-form-start-at').locator('input').fill('2026-10-01 10:00:00')
+  await page.getByTestId('album-form-start-at').locator('input').fill('2026-10-01') // UI06：日期粒度
   await page.keyboard.press('Enter')
   await page.getByTestId('album-form-submit').click()
   // 保存成功后跳相册详情；返回列表做断言
diff --git a/apps/admin/e2e/albums.spec.ts b/apps/admin/e2e/albums.spec.ts
index a54cdaa..91ae5ba 100644
--- a/apps/admin/e2e/albums.spec.ts
+++ b/apps/admin/e2e/albums.spec.ts
@@ -23,7 +23,7 @@ async function createAlbumViaUi(page: Page): Promise<string> {
   await page.getByRole('tab', { name: '英文' }).click()
   await page.getByTestId('album-form-title-en').fill(`E2E Album ${suffix}`)
   // ElDatePicker 透传 attr 被 ElTooltip 吞掉：组件里用普通 div 挂 data-test，这里进 div 找 input
-  await page.getByTestId('album-form-start-at').locator('input').fill('2026-10-01 10:00:00')
+  await page.getByTestId('album-form-start-at').locator('input').fill('2026-10-01') // UI06：日期粒度
   await page.keyboard.press('Enter')
   await page.getByTestId('album-form-submit').click()
   // 保存成功后跳相册详情；返回列表做断言
diff --git a/apps/admin/src/views/albums/form/index.vue b/apps/admin/src/views/albums/form/index.vue
index 853b1d5..da763d6 100644
--- a/apps/admin/src/views/albums/form/index.vue
+++ b/apps/admin/src/views/albums/form/index.vue
@@ -58,18 +58,20 @@
             <!-- ElDatePicker 的透传 attr 被 ElTooltip 吞掉，data-test 挂不到 DOM：
                  外层普通 div 承载选择器，测试经 div 内 input 定位 -->
             <div data-test="album-form-start-at">
+              <!-- UI06：只选日期（开始=当天 00:00；契约仍 datetime） -->
               <ElDatePicker
                 v-model="form.startAt"
-                type="datetime"
+                type="date"
                 :placeholder="t('albumsManage.form.fieldStartAt')"
               />
             </div>
           </ElFormItem>
           <ElFormItem :label="t('albumsManage.form.fieldEndAt')" :error="fieldErrors.endAt">
             <div data-test="album-form-end-at">
+              <!-- UI06：只选日期（结束=当天 23:59 全天结束语义） -->
               <ElDatePicker
                 v-model="form.endAt"
-                type="datetime"
+                type="date"
                 clearable
                 :placeholder="t('albumsManage.form.fieldEndAt')"
               />
@@ -332,14 +334,34 @@
         drafts['zh-CN'],
         drafts.en
       ]) as Api.Album.Translation[]
-      const endAt = form.endAt ? form.endAt.toISOString() : null
+      // UI06 纯日期选择：开始=当天 00:00、结束=当天 23:59（整天活动语义）。
+      const startAtDate = form.startAt!
+      const startAt = new Date(
+        startAtDate.getFullYear(),
+        startAtDate.getMonth(),
+        startAtDate.getDate(),
+        0,
+        0,
+        0
+      ).toISOString()
+      const endDate = form.endAt
+      const endAt = endDate
+        ? new Date(
+            endDate.getFullYear(),
+            endDate.getMonth(),
+            endDate.getDate(),
+            23,
+            59,
+            59
+          ).toISOString()
+        : null
       let saved: Api.Album.Detail
       if (albumId.value) {
         // 编辑：PATCH 全量可编辑字段（开关独立修改；translations 全量替换）
         saved = await fetchUpdateAlbum(albumId.value, {
           translations,
           defaultLocale: form.defaultLocale,
-          startAt: form.startAt!.toISOString(),
+          startAt,
           endAt,
           timezone: form.timezone.trim() || 'Asia/Shanghai',
           uploadEnabled: form.uploadEnabled,
@@ -352,7 +374,7 @@
         saved = await fetchCreateAlbum({
           translations,
           defaultLocale: form.defaultLocale,
-          startAt: form.startAt!.toISOString(),
+          startAt,
           endAt,
           timezone: form.timezone.trim() || 'Asia/Shanghai',
           downloadEnabled: form.downloadEnabled,
diff --git a/apps/mobile/lib/pages/album_form_page.dart b/apps/mobile/lib/pages/album_form_page.dart
index a0fecdf..8d10bd7 100644
--- a/apps/mobile/lib/pages/album_form_page.dart
+++ b/apps/mobile/lib/pages/album_form_page.dart
@@ -355,17 +355,14 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
       lastDate: DateTime(2100),
     );
     if (pickedDate == null || !mounted) return;
-    final pickedTime = await showTimePicker(
-      context: context,
-      initialTime: TimeOfDay(hour: wall.hour, minute: wall.minute),
-    );
-    if (pickedTime == null || !mounted) return;
+    // UI06（用户需求 2026-09-23）：只选日期不带时间——开始=当天 00:00，
+    // 结束=当天 23:59（活动整天语义；契约仍为 datetime，仅交互粒度变化）。
     final naive = DateTime(
       pickedDate.year,
       pickedDate.month,
       pickedDate.day,
-      pickedTime.hour,
-      pickedTime.minute,
+      isStart ? 0 : 23,
+      isStart ? 0 : 59,
     );
     final utc = albumWallClockToUtc(naive, tzName);
     setState(() {
@@ -764,9 +761,13 @@ class _AlbumFormPageState extends ConsumerState<AlbumFormPage>
     final l10n = AppLocalizations.of(context);
     final theme = Theme.of(context);
     final value = isStart ? _startAt : _endAt;
-    final formatted = value == null
+    // 只显日期（选择粒度为日期；时间由开始/结束日的 00:00/23:59 语义承载）。
+    final wallShown = value == null
         ? null
-        : formatAlbumDateTime(value, _timezone.text, l10n.localeName);
+        : (tryToAlbumZone(value, _timezone.text.trim()) ?? value.toUtc());
+    final formatted = wallShown == null
+        ? null
+        : '${wallShown.year}/${wallShown.month}/${wallShown.day}';
     return Padding(
       padding: const EdgeInsets.only(bottom: 12),
       child: InkWell(
diff --git a/apps/mobile/test/pages/album_form_page_test.dart b/apps/mobile/test/pages/album_form_page_test.dart
index d518a43..0150ea2 100644
--- a/apps/mobile/test/pages/album_form_page_test.dart
+++ b/apps/mobile/test/pages/album_form_page_test.dart
@@ -258,8 +258,8 @@ void main() {
     );
     expect(titleField.controller!.text, '开幕晚宴');
     // 时间回显按相册时区。
-    expect(find.text('2026/9/18 14:30'), findsOneWidget);
-    expect(find.text('2026/9/19 18:00'), findsOneWidget);
+    expect(find.text('2026/9/18'), findsOneWidget); // UI06：日期粒度显示
+    expect(find.text('2026/9/19'), findsOneWidget); // UI06：日期粒度显示
     // 无任何变更 → 保存禁用（PATCH minProperties 1）。
     expect(
       tester.widget<FilledButton>(find.byType(FilledButton)).onPressed,