diff --git a/app/Http/Controllers/Business/SystemizationTodos.php b/app/Http/Controllers/Business/SystemizationTodos.php
index dbe64d81..a3b2f732 100644
--- a/app/Http/Controllers/Business/SystemizationTodos.php
+++ b/app/Http/Controllers/Business/SystemizationTodos.php
@@ -685,7 +685,9 @@ class SystemizationTodos extends Controller
             'owner' => ['nullable', 'string', 'max:255'],
             'assignee' => ['nullable', 'string', 'max:255'],
             'start_date' => ['nullable', 'date_format:Y-m-d'],
+            'start_note' => ['nullable', 'string', 'max:50'],
             'due_date' => ['nullable', 'date_format:Y-m-d', 'after_or_equal:start_date'],
+            'due_note' => ['nullable', 'string', 'max:50'],
             'status' => ['required', Rule::in(SystemizationTodo::STATUSES)],
             'completed_at' => ['nullable', 'date_format:Y-m-d'],
             'progress' => ['nullable', 'string', 'max:10000'],
diff --git a/resources/views/business/pages/systemization-todos.blade.php b/resources/views/business/pages/systemization-todos.blade.php
index 7860d04b..10880aa0 100644
--- a/resources/views/business/pages/systemization-todos.blade.php
+++ b/resources/views/business/pages/systemization-todos.blade.php
@@ -104,6 +104,13 @@
         .sys-todo-field input, .sys-todo-field select, .sys-todo-field textarea { width:100%; padding:.5rem .6rem; border:1px solid var(--sys-border); border-radius:.45rem; background:#fff; color:#171717; font:inherit; font-size:.8125rem; }
         .sys-todo-field input, .sys-todo-field select { min-height:2.15rem; }
         .sys-todo-field textarea { min-height:5.5rem; resize:vertical; line-height:1.55; overflow:hidden; }
+        .sys-todo-date-control { display:flex; align-items:center; gap:.45rem; min-width:0; }
+        .sys-todo-date-control input[type="date"] { flex:1 1 auto; min-width:0; }
+        .sys-todo-date-control.is-pending input[type="date"] { background:#f7f0de; color:#777; }
+        .sys-todo-date-pending { display:inline-flex; flex:0 0 auto; align-items:center; gap:.3rem; min-height:2.15rem; padding:0 .55rem; border:1px solid var(--sys-border); border-radius:.45rem; background:#fcfaf5; color:#51483c; font-size:.75rem; white-space:nowrap; cursor:pointer; }
+        .sys-todo-date-pending input[type="checkbox"] { width:1rem; height:1rem; min-height:0; padding:0; accent-color:var(--sys-gold); }
+        .sys-todo-date-note { color:#856632; font-size:.68rem; line-height:1.4; }
+        .sys-todo-date-note[hidden] { display:none; }
         .sys-todo-new-category { margin-top:.35rem; }
         .sys-todo-new-category[hidden] { display:none; }
         .sys-todo-owner-checks { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:.2rem .45rem; max-height:7rem; padding:.4rem; border:1px solid var(--sys-border); border-radius:.45rem; background:#fff; overflow:auto; }
@@ -362,7 +369,9 @@
                         'owner' => $item->owner ?? '',
                         'assignee' => $item->assignee ?? '',
                         'start_date' => $item->start_date?->format('Y-m-d') ?? '',
+                        'start_note' => $item->start_note ?? '',
                         'due_date' => $item->due_date?->format('Y-m-d') ?? '',
+                        'due_note' => $item->due_note ?? '',
                         'status' => $item->status,
                         'completed_at' => $item->completed_at?->format('Y-m-d') ?? '',
                         'progress' => $item->progress ?? '',
@@ -525,8 +534,30 @@
                         <input type="hidden" name="owner" data-sys-todo-owner-value>
                     </div>
                     <label class="sys-todo-field sys-todo-field--3">责任人<input name="assignee" maxlength="255" list="sysTodoAssignees"></label>
-                    <label class="sys-todo-field sys-todo-field--3">开始时间<input type="date" name="start_date"></label>
-                    <label class="sys-todo-field sys-todo-field--3">完成时间<input type="date" name="due_date"></label>
+                    <div class="sys-todo-field sys-todo-field--3">
+                        <label for="sysTodoStartDate">开始时间</label>
+                        <div class="sys-todo-date-control" data-sys-todo-date-control="start">
+                            <input id="sysTodoStartDate" type="date" name="start_date">
+                            <label class="sys-todo-date-pending">
+                                <input type="checkbox" data-sys-todo-date-pending="start">
+                                <span>待定</span>
+                            </label>
+                        </div>
+                        <input type="hidden" name="start_note" data-sys-todo-date-note="start">
+                        <span class="sys-todo-date-note" data-sys-todo-date-note-caption="start" hidden></span>
+                    </div>
+                    <div class="sys-todo-field sys-todo-field--3">
+                        <label for="sysTodoDueDate">完成时间</label>
+                        <div class="sys-todo-date-control" data-sys-todo-date-control="due">
+                            <input id="sysTodoDueDate" type="date" name="due_date">
+                            <label class="sys-todo-date-pending">
+                                <input type="checkbox" data-sys-todo-date-pending="due">
+                                <span>待定</span>
+                            </label>
+                        </div>
+                        <input type="hidden" name="due_note" data-sys-todo-date-note="due">
+                        <span class="sys-todo-date-note" data-sys-todo-date-note-caption="due" hidden></span>
+                    </div>
                     <label class="sys-todo-field sys-todo-field--6">待办事项<textarea name="title" maxlength="5000" required data-sys-todo-auto-grow></textarea></label>
                     <label class="sys-todo-field sys-todo-field--6">完成情况<textarea name="progress" maxlength="10000" data-sys-todo-auto-grow></textarea></label>
                     <label class="sys-todo-field sys-todo-field--6">备注<textarea name="notes" maxlength="10000" data-sys-todo-auto-grow></textarea></label>
@@ -627,6 +658,20 @@
             var sectionValue = dialog.querySelector('[data-sys-todo-section-value]');
             var newSectionWrap = dialog.querySelector('[data-sys-todo-new-section]');
             var newSectionInput = dialog.querySelector('[data-sys-todo-new-section-input]');
+            var startDateControl = {
+                input: form.querySelector('[name="start_date"]'),
+                pending: dialog.querySelector('[data-sys-todo-date-pending="start"]'),
+                note: form.querySelector('[data-sys-todo-date-note="start"]'),
+                caption: dialog.querySelector('[data-sys-todo-date-note-caption="start"]'),
+                wrap: dialog.querySelector('[data-sys-todo-date-control="start"]'),
+            };
+            var dueDateControl = {
+                input: form.querySelector('[name="due_date"]'),
+                pending: dialog.querySelector('[data-sys-todo-date-pending="due"]'),
+                note: form.querySelector('[data-sys-todo-date-note="due"]'),
+                caption: dialog.querySelector('[data-sys-todo-date-note-caption="due"]'),
+                wrap: dialog.querySelector('[data-sys-todo-date-control="due"]'),
+            };
             var positionField = dialog.querySelector('[data-sys-todo-position-field]');
             var positionSelect = dialog.querySelector('[data-sys-todo-position]');
             var ownerValue = dialog.querySelector('[data-sys-todo-owner-value]');
@@ -671,6 +716,47 @@
                 if (field) field.value = value || '';
             }
 
+            function updateDateNoteCaption(control) {
+                var note = control.note.value.trim();
+                var showPreserved = !control.pending.checked
+                    && control.input.value === ''
+                    && note !== ''
+                    && note !== '待定';
+                control.caption.hidden = !showPreserved;
+                control.caption.textContent = showPreserved ? '原时间备注：' + note : '';
+            }
+
+            function syncDateControl(control, fromToggle) {
+                control.wrap.classList.toggle('is-pending', control.pending.checked);
+                if (control.pending.checked) {
+                    control.input.value = '';
+                    control.input.disabled = true;
+                    control.note.value = '待定';
+                    updateDateNoteCaption(control);
+                    return;
+                }
+
+                control.input.disabled = false;
+                if (control.input.value !== '') {
+                    control.note.value = '';
+                    control.input.dataset.originalNote = '';
+                } else if (fromToggle) {
+                    var originalNote = control.input.dataset.originalNote || '';
+                    control.note.value = originalNote !== '待定' ? originalNote : '';
+                }
+                updateDateNoteCaption(control);
+            }
+
+            function applyDateControl(control, dateValue, noteValue) {
+                var normalizedDate = String(dateValue || '');
+                var normalizedNote = String(noteValue || '');
+                control.input.value = normalizedDate;
+                control.input.dataset.originalNote = normalizedNote;
+                control.note.value = normalizedNote;
+                control.pending.checked = normalizedDate === '' && normalizedNote === '待定';
+                syncDateControl(control, false);
+            }
+
             function resizeTextarea(field) {
                 if (!field || field.offsetParent === null) return;
                 field.style.height = 'auto';
@@ -974,8 +1060,8 @@
                     setValue('title', payload.title);
                     setOwnerValue(payload.owner);
                     setValue('assignee', payload.assignee);
-                    setValue('start_date', payload.start_date);
-                    setValue('due_date', payload.due_date);
+                    applyDateControl(startDateControl, payload.start_date, payload.start_note);
+                    applyDateControl(dueDateControl, payload.due_date, payload.due_note);
                     setValue('status', payload.status);
                     setValue('completed_at', payload.completed_at);
                     setValue('progress', payload.progress);
@@ -984,6 +1070,8 @@
                     setCategoryValue('');
                     refreshSectionOptions('');
                     setOwnerValue('');
+                    applyDateControl(startDateControl, '', '');
+                    applyDateControl(dueDateControl, '', '');
                 }
                 if (!currentTodoId && !(payload && payload.status)) {
                     setValue('status', '待办');
@@ -1155,6 +1243,19 @@
                     populatePositionOptions();
                 }
             });
+            [startDateControl, dueDateControl].forEach(function (control) {
+                control.pending.addEventListener('change', function () {
+                    syncDateControl(control, true);
+                });
+                ['input', 'change'].forEach(function (eventName) {
+                    control.input.addEventListener(eventName, function () {
+                        if (control.input.value !== '') {
+                            control.pending.checked = false;
+                        }
+                        syncDateControl(control, false);
+                    });
+                });
+            });
             dialog.addEventListener('input', function (event) {
                 if (event.target.matches('[data-sys-todo-auto-grow]')) resizeTextarea(event.target);
             });
diff --git a/tests/Feature/Business/SystemizationTodosTest.php b/tests/Feature/Business/SystemizationTodosTest.php
index 9e8bc626..c9d782b5 100644
--- a/tests/Feature/Business/SystemizationTodosTest.php
+++ b/tests/Feature/Business/SystemizationTodosTest.php
@@ -32,7 +32,10 @@ class SystemizationTodosTest extends FeatureTestCase
             ->assertSeeText('已逾期')
             ->assertSeeText('开始时间')
             ->assertSeeText('完成时间')
+            ->assertSeeText('待定')
             ->assertSee('data-sys-todo-create', false)
+            ->assertSee('data-sys-todo-date-pending="start"', false)
+            ->assertSee('data-sys-todo-date-pending="due"', false)
             ->assertSee('data-sys-todo-owner-filter', false)
             ->assertSee('data-sys-todo-assignee-filter', false)
             ->assertSee('name="owner[]"', false)
@@ -358,6 +361,52 @@ class SystemizationTodosTest extends FeatureTestCase
         }
     }
 
+    public function test_manual_edit_saves_and_preserves_pending_date_notes(): void
+    {
+        $this->loginAs();
+
+        $this->post(route('business.systemization-todos.store'), [
+            'category' => '收入',
+            'section' => '平台收入核对',
+            'title' => '待确认开始与完成日期',
+            'owner' => '晨曦',
+            'assignee' => '栎阳',
+            'start_date' => null,
+            'start_note' => '待定',
+            'due_date' => null,
+            'due_note' => '待定',
+            'status' => SystemizationTodo::STATUS_PENDING,
+            'progress' => '',
+            'notes' => '',
+        ])->assertRedirect();
+
+        $todo = SystemizationTodo::query()->firstOrFail();
+        $this->assertNull($todo->start_date);
+        $this->assertSame('待定', $todo->start_note);
+        $this->assertNull($todo->due_date);
+        $this->assertSame('待定', $todo->due_note);
+
+        $this->patch(route('business.systemization-todos.update', ['todo' => $todo->id]), [
+            'category' => '收入',
+            'section' => '平台收入核对',
+            'title' => '待确认开始与完成日期（已更新）',
+            'owner' => '晨曦',
+            'assignee' => '栎阳',
+            'start_date' => null,
+            'start_note' => '待定',
+            'due_date' => null,
+            'due_note' => '11月',
+            'status' => SystemizationTodo::STATUS_IN_PROGRESS,
+            'progress' => '等待平台确认',
+            'notes' => '',
+        ])->assertRedirect();
+
+        $todo->refresh();
+        $this->assertSame('待确认开始与完成日期（已更新）', $todo->title);
+        $this->assertSame('待定', $todo->start_note);
+        $this->assertSame('11月', $todo->due_note);
+    }
+
     public function test_page_filters_by_date_and_merges_adjacent_category_and_section_cells(): void
     {
         $this->loginAs();