diff --git a/packages/mitmproxy/src/lib/dns/base.js b/packages/mitmproxy/src/lib/dns/base.js
index 567193c..6bbb815 100644
--- a/packages/mitmproxy/src/lib/dns/base.js
+++ b/packages/mitmproxy/src/lib/dns/base.js
@@ -70,7 +70,7 @@ module.exports = class BaseDNS {
         this.cache.set(hostname, ipCache)
       }
 
-      const t = new Date()
+      const t = Date.now()
       let ipList = await this._lookupWithPreSetIpList(hostname)
       if (ipList == null) {
         // 没有获取到ipv4地址
@@ -81,7 +81,7 @@ module.exports = class BaseDNS {
       ipCache.setBackupList(ipList)
 
       const ip = ipCache.value
-      log.info(`[DNS-over-${this.dnsType} '${this.dnsName}'] ${hostname} ➜ ${ip} (${new Date() - t} ms), ipList: ${JSON.stringify(ipList)}, ipCache:`, JSON.stringify(ipCache))
+      log.info(`[DNS-over-${this.dnsType} '${this.dnsName}'] ${hostname} ➜ ${ip} (${Date.now() - t} ms), ipList: ${JSON.stringify(ipList)}, ipCache:`, JSON.stringify(ipCache))
 
       if (ipChecker) {
         if (ip != null && ip !== hostname && ipChecker(ip)) {
diff --git a/packages/mitmproxy/src/lib/proxy/mitmproxy/createConnectHandler.js b/packages/mitmproxy/src/lib/proxy/mitmproxy/createConnectHandler.js
index bed1845..3f1e0be 100644
--- a/packages/mitmproxy/src/lib/proxy/mitmproxy/createConnectHandler.js
+++ b/packages/mitmproxy/src/lib/proxy/mitmproxy/createConnectHandler.js
@@ -55,7 +55,7 @@ module.exports = function createConnectHandler (sslConnectInterceptor, middlewar
 function connect (req, cltSocket, head, hostname, port, dnsConfig = null, isDirect = false, target = null) {
   // tunneling https
   // log.info('connect:', hostname, port)
-  const start = new Date()
+  const start = Date.now()
   const isDnsIntercept = {}
   const hostport = `${hostname}:${port}`
 
@@ -134,7 +134,7 @@ function connect (req, cltSocket, head, hostname, port, dnsConfig = null, isDire
       cltSocket.pipe(proxySocket)
     })
     proxySocket.on('timeout', () => {
-      const cost = new Date() - start
+      const cost = Date.now() - start
       const errorMsg = `${isDirect ? '直连' : '代理连接'}超时: ${hostport}, cost: ${cost} ms`
       log.error(errorMsg)
 
@@ -148,7 +148,7 @@ function connect (req, cltSocket, head, hostname, port, dnsConfig = null, isDire
     })
     proxySocket.on('error', (e) => {
       // 连接失败，可能被GFW拦截，或者服务端拥挤
-      const cost = new Date() - start
+      const cost = Date.now() - start
       const errorMsg = `${isDirect ? '直连' : '代理连接'}失败: ${hostport}, cost: ${cost} ms, errorMsg: ${e.message}`
       log.error(`${errorMsg}\r\n`, e)
 
diff --git a/packages/mitmproxy/src/lib/proxy/mitmproxy/createRequestHandler.js b/packages/mitmproxy/src/lib/proxy/mitmproxy/createRequestHandler.js
index 0738f9a..a8876f6 100644
--- a/packages/mitmproxy/src/lib/proxy/mitmproxy/createRequestHandler.js
+++ b/packages/mitmproxy/src/lib/proxy/mitmproxy/createRequestHandler.js
@@ -109,7 +109,7 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
 
         function onFree () {
           url = `${rOptions.method} ➜ ${rOptions.protocol}//${rOptions.hostname}:${rOptions.port}${rOptions.path}`
-          const start = new Date()
+          const start = Date.now()
           log.info('发起代理请求:', url, (rOptions.servername ? `, sni: ${rOptions.servername}` : ''), ', headers:', jsonApi.stringify2(rOptions.headers))
 
           const isDnsIntercept = {}
@@ -156,7 +156,7 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
           }
 
           proxyReq = (rOptions.protocol === 'https:' ? https : http).request(rOptions, (proxyRes) => {
-            const cost = new Date() - start
+            const cost = Date.now() - start
             if (rOptions.protocol === 'https:') {
               log.info(`代理请求返回: 【${proxyRes.statusCode}】${url}, cost: ${cost} ms`)
             } else {
@@ -173,7 +173,7 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
 
           // 代理请求的事件监听
           proxyReq.on('timeout', () => {
-            const cost = new Date() - start
+            const cost = Date.now() - start
             const errorMsg = `代理请求超时: ${url}, cost: ${cost} ms`
             log.error(errorMsg, ', rOptions:', jsonApi.stringify2(rOptions))
             countSlow(isDnsIntercept, `代理请求超时, cost: ${cost} ms`)
@@ -184,7 +184,7 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
             reject(error)
           })
           proxyReq.on('error', (e) => {
-            const cost = new Date() - start
+            const cost = Date.now() - start
             log.error(`代理请求错误: ${url}, cost: ${cost} ms, error:`, e, ', rOptions:', jsonApi.stringify2(rOptions))
             countSlow(isDnsIntercept, `代理请求错误: ${e.message}`)
             reject(e)
@@ -195,7 +195,7 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
             }
           })
           proxyReq.on('aborted', () => {
-            const cost = new Date() - start
+            const cost = Date.now() - start
             const errorMsg = `代理请求被取消: ${url}, cost: ${cost} ms`
             log.error(errorMsg, ', rOptions:', jsonApi.stringify2(rOptions))
 
@@ -211,7 +211,7 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
 
           // 原始请求的事件监听
           req.on('aborted', () => {
-            const cost = new Date() - start
+            const cost = Date.now() - start
             const errorMsg = `请求被取消: ${url}, cost: ${cost} ms`
             log.error(errorMsg, ', rOptions:', jsonApi.stringify2(rOptions))
             proxyReq.abort()
@@ -221,12 +221,12 @@ module.exports = function createRequestHandler (createIntercepts, middlewares, e
             reject(new Error(errorMsg))
           })
           req.on('error', (e, req, res) => {
-            const cost = new Date() - start
+            const cost = Date.now() - start
             log.error(`请求错误: ${url}, cost: ${cost} ms, error:`, e, ', rOptions:', jsonApi.stringify2(rOptions))
             reject(e)
           })
           req.on('timeout', () => {
-            const cost = new Date() - start
+            const cost = Date.now() - start
             const errorMsg = `请求超时: ${url}, cost: ${cost} ms`
             log.error(errorMsg, ', rOptions:', jsonApi.stringify2(rOptions))
             reject(new Error(errorMsg))
diff --git a/packages/mitmproxy/src/lib/proxy/tls/tlsUtils.js b/packages/mitmproxy/src/lib/proxy/tls/tlsUtils.js
index 2e44900..b8b02e8 100644
--- a/packages/mitmproxy/src/lib/proxy/tls/tlsUtils.js
+++ b/packages/mitmproxy/src/lib/proxy/tls/tlsUtils.js
@@ -22,8 +22,8 @@ utils.createCA = function (CN) {
   const keys = pki.rsa.generateKeyPair(2048)
   const cert = pki.createCertificate()
   cert.publicKey = keys.publicKey
-  cert.serialNumber = `${(new Date()).getTime()}`
-  cert.validity.notBefore = new Date(new Date() - (60 * 60 * 1000))
+  cert.serialNumber = `${Date.now()}`
+  cert.validity.notBefore = new Date(Date.now() - (60 * 60 * 1000))
   cert.validity.notAfter = new Date()
   cert.validity.notAfter.setFullYear(cert.validity.notAfter.getFullYear() + 20)
   const attrs = [{
@@ -87,7 +87,7 @@ utils.createFakeCertificateByDomain = function (caKey, caCert, domain, mappingHo
   const cert = pki.createCertificate()
   cert.publicKey = keys.publicKey
 
-  cert.serialNumber = `${(new Date()).getTime()}`
+  cert.serialNumber = `${Date.now()}`
   cert.validity.notBefore = new Date()
   cert.validity.notBefore.setFullYear(cert.validity.notBefore.getFullYear() - 1)
   cert.validity.notAfter = new Date()