fix(FEAT-MO-001): 修正概览时间时区显示

web/src/utils/datetime.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest';
+
+import { formatShanghaiDateTime, formatShanghaiTime } from './datetime';
+
+describe('A 股时间显示格式化', () => {
+  it('将 UTC ISO 时间转换为上海时区的完整日期时间', () => {
+    expect(formatShanghaiDateTime('2026-08-24T14:16:26.813Z')).toBe('2026-08-24 22:16:26');
+  });
+
+  it('将 UTC ISO 时间转换为上海时区的时分秒', () => {
+    expect(formatShanghaiTime('2026-08-24T14:16:26.813Z')).toBe('22:16:26');
+  });
+
+  it('收到空值或非法日期时返回占位符', () => {
+    expect(formatShanghaiDateTime(undefined)).toBe('—');
+    expect(formatShanghaiTime('not-a-date')).toBe('—');
+  });
+});