diff --git a/src/helpers/file-stat.js b/src/helpers/file-stat.js
index 3891c2cc..5187da9a 100644
--- a/src/helpers/file-stat.js
+++ b/src/helpers/file-stat.js
@@ -18,7 +18,8 @@ module.exports = function (fileStat, format = 'ls') {
 function ls(fileStat) {
   const now = moment.utc();
   const mtime = moment.utc(new Date(fileStat.mtime));
-  const dateFormat = now.diff(mtime, 'months') < 6 ? 'MMM DD HH:mm' : 'MMM DD  YYYY';
+  const timeDiff = now.diff(mtime, 'months');
+  const dateFormat = timeDiff < 6 ? 'MMM DD HH:mm' : 'MMM DD  YYYY';
 
   return [
     fileStat.mode ? [
diff --git a/test/connector/passive.spec.js b/test/connector/passive.spec.js
index e6b45879..6be87f7c 100644
--- a/test/connector/passive.spec.js
+++ b/test/connector/passive.spec.js
@@ -64,7 +64,7 @@ describe('Connector - Passive //', function () {
     return passive.setupServer()
     .then(shouldNotResolve)
     .catch(err => {
-      expect(err.name).to.equal('RangeError');
+      expect(err).to.be.instanceOf(RangeError);
     });
   });
 
diff --git a/test/helpers/file-stat.spec.js b/test/helpers/file-stat.spec.js
index d273a124..eb8618f8 100644
--- a/test/helpers/file-stat.spec.js
+++ b/test/helpers/file-stat.spec.js
@@ -1,9 +1,20 @@
 const {expect} = require('chai');
+const sinon = require('sinon');
+const moment = require('moment');
 
 const fileStat = require('../../src/helpers/file-stat');
 const errors = require('../../src/errors');
 
 describe('helpers // file-stat', function () {
+  let sandbox;
+
+  before(function () {
+    sandbox = sinon.sandbox.create();
+  });
+  afterEach(function () {
+    sandbox.restore();
+  });
+
   const STAT = {
     name: 'test1',
     dev: 2114,
@@ -44,6 +55,11 @@ describe('helpers // file-stat', function () {
 
   describe('format - ls //', function () {
     it('formats correctly', () => {
+      const momentStub = sandbox.stub(moment, 'utc').callThrough();
+      momentStub.onFirstCall().callsFake(function () {
+        return moment.utc(new Date('Sept 10 2016'));
+      });
+
       const format = fileStat(STAT, 'ls');
       expect(format).to.equal('-rwxrwxrwx 1 85 100          527 Oct 10 23:24 test1');
     });