diff --git a/apps/web/app/workspace/page.tsx b/apps/web/app/workspace/page.tsx
index 23cc555..d1c36b8 100644
--- a/apps/web/app/workspace/page.tsx
+++ b/apps/web/app/workspace/page.tsx
@@ -21,7 +21,7 @@ import { TestCaseDetailDrawer } from '@/components/test-case/TestCaseDetailDrawe
 import { BugDetailDrawer } from '@/components/bug/BugDetailDrawer';
 import { BugCreateModal } from '@/components/bug/BugCreateModal';
 import { DEV_TASK_STATUS_LABEL, DEV_TASK_STATUS_COLOR, getEstimateHours, getActualHours } from '@/lib/dev-task';
-import { formatDateTime } from '@/lib/format';
+import { formatDateTime, formatLocalDate } from '@/lib/format';
 import { formatShortTime, formatWorkHours } from '@/lib/work-hours';
 import { TEST_CASE_STATUS_LABEL, TEST_CASE_STATUS_COLOR } from '@/lib/test-case';
 import { BUG_STATUS_LABEL, BUG_STATUS_COLOR, BUG_SEVERITY_LABEL, BUG_SEVERITY_COLOR } from '@/lib/bug';
@@ -118,7 +118,7 @@ export default function WorkspacePage() {
     return items.sort((a, b) => (a.completed !== b.completed ? (a.completed ? 1 : -1) : 0));
   }, [workItems, activeTab, showCompleted, selectedVersionId]);
 
-  const today = useMemo(() => new Date().toISOString().slice(0, 10), []);
+  const today = useMemo(() => formatLocalDate(), []);
 
   const dailyReport = useMemo(() =>
     getWorkspaceDailyReport({
diff --git a/apps/web/components/dev-task/WorklogPanel.tsx b/apps/web/components/dev-task/WorklogPanel.tsx
index 5060ba7..8603332 100644
--- a/apps/web/components/dev-task/WorklogPanel.tsx
+++ b/apps/web/components/dev-task/WorklogPanel.tsx
@@ -5,6 +5,7 @@ import { Plus, Trash2 } from 'lucide-react';
 import { useTaskWorklogStore } from '@/stores/useTaskWorklogStore';
 import { useAuthStore } from '@/stores/useAuthStore';
 import { getTaskWorklogs } from '@/lib/task-worklog';
+import { formatLocalDate } from '@/lib/format';
 
 interface Props {
   taskId: string;
@@ -17,7 +18,7 @@ export function WorklogPanel({ taskId }: Props) {
   const taskLogs = getTaskWorklogs(worklogs, taskId);
   const totalHours = taskLogs.reduce((sum, w) => sum + w.hours, 0);
 
-  const today = new Date().toISOString().slice(0, 10);
+  const today = formatLocalDate();
   const [date, setDate] = useState(today);
   const [hours, setHours] = useState<number>(1);
   const [workContent, setWorkContent] = useState('');
diff --git a/apps/web/lib/format.test.ts b/apps/web/lib/format.test.ts
new file mode 100644
index 0000000..1a1e11a
--- /dev/null
+++ b/apps/web/lib/format.test.ts
@@ -0,0 +1,12 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { formatLocalDate } from './format';
+
+test('formatLocalDate formats a local calendar date as YYYY-MM-DD', () => {
+  assert.equal(formatLocalDate(new Date(2026, 5, 26, 23, 59)), '2026-06-26');
+});
+
+test('formatLocalDate pads month and day', () => {
+  assert.equal(formatLocalDate(new Date(2026, 0, 2, 8, 5)), '2026-01-02');
+});
diff --git a/apps/web/lib/format.ts b/apps/web/lib/format.ts
index f07f010..9aa7fe0 100644
--- a/apps/web/lib/format.ts
+++ b/apps/web/lib/format.ts
@@ -34,6 +34,13 @@ export function formatDate(iso?: string | null): string {
 /**
  * 格式化为 MM-DD HH:mm（紧凑版，本地时区）
  */
+export function formatLocalDate(date: Date = new Date()): string {
+  const yyyy = date.getFullYear();
+  const mm = String(date.getMonth() + 1).padStart(2, '0');
+  const dd = String(date.getDate()).padStart(2, '0');
+  return `${yyyy}-${mm}-${dd}`;
+}
+
 export function formatDateTimeShort(iso?: string | null): string {
   if (!iso) return '-';
   const d = new Date(iso);