diff --git a/frontend/src/views/backtest/History.vue b/frontend/src/views/backtest/History.vue
index 2ec6fee..03bdc93 100644
--- a/frontend/src/views/backtest/History.vue
+++ b/frontend/src/views/backtest/History.vue
@@ -212,7 +212,8 @@ function durationText(row: TaskListItem): string {
   if (row.duration_s != null) return fmtDuration(row.duration_s)
   if (isActive(row) && row.created_at) {
     const start = new Date(row.created_at.replace(' ', 'T')).getTime()
-    if (!Number.isNaN(start) && start <= nowTick.value) return fmtDuration(Math.max(0, Math.floor((nowTick.value - start) / 1000)))
+    // 钳 0:本机时钟略慢于服务端时 start 会短暂"在未来",显示 0s 而非 —
+    if (!Number.isNaN(start)) return fmtDuration(Math.max(0, Math.floor((nowTick.value - start) / 1000)))
   }
   return '—'
 }