修复日期处理问题：移除重复的时区转换，确保数据库存储正确的北京时间

certificate.html

@@ -488,6 +488,16 @@
         });
     }
     
+    // 格式化日期，确保只显示到日
+    function formatDate(dateValue) {
+      if (!dateValue) return '';
+      // 如果是完整的日期时间字符串，只取日期部分
+      if (typeof dateValue === 'string' && dateValue.includes('T')) {
+        return dateValue.split('T')[0];
+      }
+      return dateValue;
+    }
+    
     // 显示合格证信息
     function displayCertificate(certificate) {
       const container = document.getElementById('certificateInfo');
@@ -520,7 +530,7 @@
         </div>
         <div class="info-item">
           <span class="label">开具日期：</span>
-          <span class="value">${certificate.date || ''}</span>
+          <span class="value">${formatDate(certificate.date) || ''}</span>
         </div>
       `;
       

server.js

@@ -81,7 +81,7 @@ const server = http.createServer(async (req, res) => {
     try {
       // 从数据库获取最新的合格证信息
       const [rows] = await pool.execute(
-        'SELECT company as subjectName, phoneNumber as contact, productName, grossWeight as weight, commitBasis as basis, origin, issueDate, DATE_FORMAT(issueDate, "%Y-%m-%d") as date, signature FROM certificate ORDER BY id DESC LIMIT 1'
+        'SELECT company as subjectName, phoneNumber as contact, productName, grossWeight as weight, commitBasis as basis, origin, DATE_FORMAT(issueDate, "%Y-%m-%d") as date, signature FROM certificate ORDER BY id DESC LIMIT 1'
       );
       
       const certificate = rows.length > 0 ? rows[0] : null;
@@ -120,9 +120,8 @@ const server = http.createServer(async (req, res) => {
         try {
           // 解析表单数据
           const formData = new URLSearchParams(body);
-          // 使用当前的北京时间（精确到秒）作为开具日期
+          // 使用当前时间作为开具日期，数据库连接已配置为北京时间
           const now = new Date();
-          const beijingTime = new Date(now.getTime() + 8 * 60 * 60 * 1000); // 转换为北京时间
           
           const certificate = {
             subjectName: formData.get('subjectName'),
@@ -131,7 +130,7 @@ const server = http.createServer(async (req, res) => {
             weight: formData.get('weight'),
             basis: formData.get('basis'),
             origin: formData.get('origin'),
-            date: beijingTime,
+            date: now,
             signature: formData.get('signature')
           };
           
@@ -176,19 +175,21 @@ const server = http.createServer(async (req, res) => {
           
           console.log('数据插入数据库成功');
           
-          // 返回成功响应，确保返回的signature是OSS URL
-          const responseCertificate = {
-            ...certificate,
-            signature: signatureUrl
-          };
-          
-          res.writeHead(200, { 
-            'Content-Type': 'application/json',
-            'Access-Control-Allow-Origin': '*',
-            'Access-Control-Allow-Methods': 'POST, GET, OPTIONS',
-            'Access-Control-Allow-Headers': 'Content-Type'
-          });
-          res.end(JSON.stringify({ success: true, certificate: responseCertificate }));
+          // 返回成功响应，确保返回的signature是OSS URL，日期只显示到日
+        const responseCertificate = {
+          ...certificate,
+          signature: signatureUrl,
+          // 格式化日期为YYYY-MM-DD格式
+          date: certificate.date.toISOString().split('T')[0]
+        };
+        
+        res.writeHead(200, { 
+          'Content-Type': 'application/json',
+          'Access-Control-Allow-Origin': '*',
+          'Access-Control-Allow-Methods': 'POST, GET, OPTIONS',
+          'Access-Control-Allow-Headers': 'Content-Type'
+        });
+        res.end(JSON.stringify({ success: true, certificate: responseCertificate }));
         } catch (error) {
           console.error('处理表单数据失败:', error.message);
           res.writeHead(500, {