diff --git a/src/models/redis.js b/src/models/redis.js
index 9473724b..29efdca1 100644
--- a/src/models/redis.js
+++ b/src/models/redis.js
@@ -5,8 +5,9 @@ const logger = require('../utils/logger');
 // 时区辅助函数
 function getDateInTimezone(date = new Date()) {
   const offset = config.system.timezoneOffset || 8; // 默认UTC+8
-  const utcTime = date.getTime() + (date.getTimezoneOffset() * 60000);
-  const targetTime = new Date(utcTime + (offset * 3600000));
+  // 直接基于UTC时间计算目标时区时间
+  // 不需要考虑本地时区，因为我们总是基于UTC
+  const targetTime = new Date(date.getTime() + (offset * 3600000));
   return targetTime;
 }
 
diff --git a/src/routes/admin.js b/src/routes/admin.js
index e3d118e8..b4a4a088 100644
--- a/src/routes/admin.js
+++ b/src/routes/admin.js
@@ -1341,8 +1341,8 @@ router.get('/usage-trend', authenticateAdmin, async (req, res) => {
         }
         
         trendData.push({
-          date: dateStr, // 保持日期格式一致
-          hour: currentHour.toISOString(),
+          // 对于小时粒度，只返回hour字段，不返回date字段
+          hour: tzCurrentHour.toISOString(), // 使用转换后的时区时间
           inputTokens: hourInputTokens,
           outputTokens: hourOutputTokens,
           requests: hourRequests,
@@ -1710,7 +1710,7 @@ router.get('/api-keys-usage-trend', authenticateAdmin, async (req, res) => {
         const keys = await client.keys(pattern);
         
         const hourData = {
-          hour: currentHour.toISOString(),
+          hour: tzCurrentHour.toISOString(), // 使用转换后的时区时间
           apiKeys: {}
         };
         
diff --git a/web/admin-spa/src/views/DashboardView.vue b/web/admin-spa/src/views/DashboardView.vue
index c114249c..014d976c 100644
--- a/web/admin-spa/src/views/DashboardView.vue
+++ b/web/admin-spa/src/views/DashboardView.vue
@@ -452,6 +452,14 @@ function createUsageTrendChart() {
       const hour = String(date.getHours()).padStart(2, '0')
       return `${month}/${day} ${hour}:00`
     }
+    // 按天显示时，只显示月/日，不显示年份
+    const dateStr = d.date
+    if (dateStr && dateStr.includes('-')) {
+      const parts = dateStr.split('-')
+      if (parts.length >= 3) {
+        return `${parts[1]}/${parts[2]}`
+      }
+    }
     return d.date
   })
   
@@ -655,6 +663,14 @@ function createApiKeysUsageTrendChart() {
         const hour = String(date.getHours()).padStart(2, '0')
         return `${month}/${day} ${hour}:00`
       }
+      // 按天显示时，只显示月/日，不显示年份
+      const dateStr = d.date
+      if (dateStr && dateStr.includes('-')) {
+        const parts = dateStr.split('-')
+        if (parts.length >= 3) {
+          return `${parts[1]}/${parts[2]}`
+        }
+      }
       return d.date
     }),
     datasets: datasets