diff --git a/public/views/walletHome.html b/public/views/walletHome.html
index b589ea1ee..1ae3f96db 100644
--- a/public/views/walletHome.html
+++ b/public/views/walletHome.html
@@ -504,7 +504,7 @@
                 <a fast-click callback-fn="home.resetForm(sendForm)" class="button expand outline dark-gray round" translate>Cancel</a>
               </div>
               <div class="columns" ng-class="{'small-6 medium-6 large-6':(home._paypro || home.lockAddress || home.lockAmount)}">
-                <button class="button black round expand" ng-disabled="sendForm.$invalid || home.blockUx || index.isOffline"
+                <button class="button black round expand" ng-disabled="sendForm.$invalid || home.blockUx || index.isOffline || home.paymentExpired"
                   ng-style="{'background-color':index.backgroundColor}" fast-click callback-fn="home.submitForm()" translate>
                   Send
                 </button>
diff --git a/src/js/controllers/walletHome.js b/src/js/controllers/walletHome.js
index 478efdc1f..4ec000ee4 100644
--- a/src/js/controllers/walletHome.js
+++ b/src/js/controllers/walletHome.js
@@ -23,6 +23,7 @@ angular.module('copayApp.controllers').controller('walletHomeController', functi
   ret.addresses = [];
   ret.isMobile = isMobile.any();
   ret.isWindowsPhoneApp = isMobile.Windows() && isCordova;
+  ret.countDown = null;
   var vanillaScope = ret;
 
   var disableScannerListener = $rootScope.$on('dataScanned', function(event, data) {
@@ -304,6 +305,7 @@ angular.module('copayApp.controllers').controller('walletHomeController', functi
   // only determined by the tx.message
   this.openTxpModal = function(tx, copayers, isGlidera) {
     $rootScope.modalOpened = true;
+    var self = this;
     var fc = profileService.focusedClient;
     var currentSpendUnconfirmed = configWallet.spendUnconfirmed;
     var ModalInstanceCtrl = function($scope, $modalInstance) {
@@ -346,18 +348,23 @@ angular.module('copayApp.controllers').controller('walletHomeController', functi
 
       function paymentTimeControl(expirationTime) {
         $scope.paymentExpired = false;
-        var countDown;
         setExpirationTime();
-        countDown = $interval(function() {
+
+        self.countDown = $interval(function() {
           setExpirationTime();
         }, 1000);
 
         function setExpirationTime() {
-          if (moment().isAfter(expirationTime * 1000)) {
+          var now = Math.floor(Date.now() / 1000);
+          if (now > expirationTime) {
             $scope.paymentExpired = true;
-            if (countDown) $interval.cancel(countDown);
+            if (self.countDown) $interval.cancel(self.countDown);
+            return;
           }
-          $scope.expires = moment(expirationTime * 1000).fromNow();
+          var totalSecs = expirationTime - now;
+          var m = Math.floor(totalSecs / 60);
+          var s = totalSecs % 60;
+          $scope.expires = ('0' + m).slice(-2) + ":" + ('0' + s).slice(-2);
         };
       };
 
@@ -994,6 +1001,7 @@ angular.module('copayApp.controllers').controller('walletHomeController', functi
 
   this.resetForm = function() {
     this.resetError();
+    if (this.countDown) $interval.cancel(this.countDown);
     this._paypro = null;
     this.lockedCurrentFeePerKb = null;
 
@@ -1114,25 +1122,31 @@ angular.module('copayApp.controllers').controller('walletHomeController', functi
 
   function _paymentTimeControl(expirationTime) {
     self.paymentExpired = false;
-    var countDown;
     setExpirationTime();
-    countDown = $interval(function() {
+
+    self.countDown = $interval(function() {
       setExpirationTime();
     }, 1000);
 
     function setExpirationTime() {
-      if (moment().isAfter(expirationTime * 1000)) {
-        setExpiredPaymentValues();
-        if (countDown) $interval.cancel(countDown);
+      var now = Math.floor(Date.now() / 1000);
+      if (now > expirationTime) {
+        setExpiredValues();
+        return;
       }
-      self.remainingTimeStr = moment(expirationTime * 1000).fromNow();
+
+      var totalSecs = expirationTime - now;
+      var m = Math.floor(totalSecs / 60);
+      var s = totalSecs % 60;
+      self.remainingTimeStr = ('0' + m).slice(-2) + ":" + ('0' + s).slice(-2);
     };
 
-    function setExpiredPaymentValues() {
+    function setExpiredValues() {
       self.paymentExpired = true;
       self.remainingTimeStr = null;
       self._paypro = null;
       self.error = gettext('Cannot sign: The payment request has expired');
+      if (self.countDown) $interval.cancel(self.countDown);
     };
   };