diff --git a/index.js b/index.js
index b4718fc..45542db 100644
--- a/index.js
+++ b/index.js
@@ -119,7 +119,7 @@ var totp = {};
 totp.gen = function(key, opt) {
 	opt = opt || {};
 	var time = opt.time || 30;
-	var _t = new Date().getTime();
+	var _t = Date.now();
 
 	// Time has been overwritten.
 	if(opt._t) {
@@ -170,7 +170,7 @@ totp.gen = function(key, opt) {
 totp.verify = function(token, key, opt) {
 	opt = opt || {};
 	var time = opt.time || 30;
-	var _t = new Date().getTime();
+	var _t = Date.now();
 
 	// Time has been overwritten.
 	if(opt._t) {