fix: use uploadTime instead of reportDate for display timestamps

src/components/ReportCard.vue

@@ -59,7 +59,7 @@
           <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z" />
           </svg>
-          {{ report.reportDate || '未知时间' }}
+          {{ formatDate(report.uploadTime) }}
         </div>
         
         <!-- Arrow indicator -->
@@ -113,6 +113,14 @@ const FileIcon = {
   }
 }
 
+// Format uploadTime to display date
+const formatDate = (isoString) => {
+  if (!isoString) return '未知时间'
+  const d = new Date(isoString)
+  const pad = n => String(n).padStart(2, '0')
+  return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`
+}
+
 const fileIconComponent = computed(() => FileIcon)
 
 const iconClass = computed(() => {