diff --git a/zhandianxinxi/光谱数据监控/src/views/Dashboard.vue b/zhandianxinxi/光谱数据监控/src/views/Dashboard.vue
index 8984720..0120ee6 100644
--- a/zhandianxinxi/光谱数据监控/src/views/Dashboard.vue
+++ b/zhandianxinxi/光谱数据监控/src/views/Dashboard.vue
@@ -341,8 +341,13 @@ const fetchData = async () => {
       const isOrphanIoT = (item.source === 'iot_card')
       const isWhitelist = !!item.is_whitelist
 
-      // === 1. 智能时间解析与格式化 (增强版) ===
-      let diffDays = 0, diffHours = 0, isToday = false, validTime = false
+      // === 1. 时间显示格式化 ===
+      // 滞后判定已统一由后端提供（stale_level / stale_days / offset），
+      // 这里只负责把 latest_time 渲染成统一格式，不再本地计算天数。
+      // 判定与渲染分家的原因见 services/time_utils.py 顶部说明。
+      const staleLevel = item.stale_level || 'unknown'
+      const staleDays = (typeof item.stale_days === 'number') ? item.stale_days : null
+      const validTime = staleLevel !== 'unknown'
       let timeStr = item.latest_time
 
       // 默认显示原始值，稍后如果解析成功则覆盖它
@@ -377,16 +382,8 @@ const fetchData = async () => {
           d = new Date(cleanStr);
         }
 
-        // C. 如果解析成功，强制重新生成统一的显示字符串
+        // C. 解析成功则强制重新生成统一的显示格式 YYYY-MM-DD HH:mm:ss
         if (d && !isNaN(d.getTime())) {
-          validTime = true
-          isToday = d.toDateString() === now.toDateString()
-
-          const diff = now - d
-          diffHours = (diff > 0 ? diff : 0) / (1000 * 3600)
-          diffDays = diffHours / 24
-
-          // 🌟 核心修改点：生成标准显示格式 YYYY-MM-DD HH:mm:ss 🌟
           const y = d.getFullYear()
           const m = String(d.getMonth() + 1).padStart(2, '0')
           const dd = String(d.getDate()).padStart(2, '0')
@@ -429,29 +426,33 @@ const fetchData = async () => {
         }
       }
 
-      // 4. 状态判定
+      // 4. 状态判定（分级由后端给出，这里只做映射，不再本地判天数）
       let statusColor = '#67C23A', statusLabel = '正常', statusType = 'normal', statusLabelColor = '#fff'
       let statusReason = ''
-      let sortWeight = diffHours
+      // 排序权重：问题设备排前面。staleDays * 24 与原 diffHours 同为小时量纲，
+      // 排序结果与原实现一致（同为“当天”的设备不再按小时细分，顺序退化为稳定序）
+      let sortWeight = (staleDays === null) ? 80000000 : staleDays * 24
 
       if (item.is_maintaining) {
         statusColor = '#409EFF'; statusLabel = '维修中'; statusType = 'maintenance';
         sortWeight = Number.MAX_SAFE_INTEGER;
       } else if (!validTime || item.status === 'offline') {
         statusLabel = '离线'; statusColor = '#F56C6C'; statusType = 'error';
-        statusReason = validTime ? '设备离线' : '暂无数据';
+        // 文案与后端 offset 统一：拿不到可解析的数据时间就说“从未同步”，
+        // 不再另造一套“暂无数据”的说法
+        statusReason = (item.status === 'offline') ? '设备离线' : (item.offset || '从未同步');
         sortWeight = 80000000;
-      } else if (diffDays > 7) {
+      } else if (staleLevel === 'severe') {
         statusLabel = '严重滞后'; statusColor = '#F56C6C'; statusType = 'error';
-        statusReason = `滞后 ${Math.floor(diffDays)} 天`;
-      } else if (diffHours > 24) {
+        statusReason = item.offset || `滞后 ${staleDays} 天`;
+      } else if (staleLevel === 'lagging') {
         statusLabel = '滞后'; statusColor = '#E6A23C'; statusType = 'warning';
-        statusReason = `滞后 ${Math.floor(diffDays)} 天`;
+        statusReason = item.offset || `滞后 ${staleDays} 天`;
       } else if (expireWarning) {
         statusLabel = '即将过期'; statusColor = '#E6A23C'; statusType = 'warning';
         statusReason = `即将过期`;
         sortWeight = 400;
-      } else if (!isToday) {
+      } else if (staleLevel === 'yesterday') {
         statusLabel = '昨日数据'; statusColor = '#FAC858'; statusType = 'slight-warning'; statusLabelColor = '#333';
         statusReason = '非今日数据';
       } else {
@@ -465,7 +466,7 @@ const fetchData = async () => {
         isOrphanIoT,
         isBound,
         isWhitelist,
-        diffDays, diffHours, sortWeight, isToday,
+        sortWeight, staleLevel, staleDays,
         statusColor, statusLabel, statusType, statusLabelColor, statusReason,
         isEditingSite: false, tempSite: '',
         data_quality: item.data_quality || 'ok',