kill Date#toISOString shim

.eslintignore

@@ -1,5 +1,4 @@
 coverage/
-lib/to-iso-string/**/*.js
 mocha.js
 BUILDTMP
 *.fixture.js

lib/utils.js

@@ -16,7 +16,6 @@ var readdirSync = require('fs').readdirSync;
 var statSync = require('fs').statSync;
 var watchFile = require('fs').watchFile;
 var lstatSync = require('fs').lstatSync;
-var toISOString = require('./to-iso-string');
 var he = require('he');
 
 /**
@@ -349,12 +348,7 @@ function jsonStringify (object, spaces, depth) {
           : val.toString();
         break;
       case 'date':
-        var sDate;
-        if (isNaN(val.getTime())) { // Invalid date
-          sDate = val.toString();
-        } else {
-          sDate = val.toISOString ? val.toISOString() : toISOString(val);
-        }
+        var sDate = isNaN(val.getTime()) ? val.toString() : val.toISOString();
         val = '[Date: ' + sDate + ']';
         break;
       case 'buffer':

test/unit/utils.spec.js

@@ -1,7 +1,6 @@
 'use strict';
 
 var utils = require('../../lib/utils');
-var toISOString = require('../../lib/to-iso-string');
 
 describe('lib/utils', function () {
   describe('clean', function () {
@@ -170,18 +169,10 @@ describe('lib/utils', function () {
     });
 
     it('should return Date object with .toISOString() + string prefix', function () {
-      expect(stringify(new Date(0))).to.equal('[Date: ' + shimToISOString(new Date(0)) + ']');
+      expect(stringify(new Date(0))).to.equal('[Date: ' + new Date(0).toISOString() + ']');
 
       var date = new Date(); // now
-      expect(stringify(date)).to.equal('[Date: ' + shimToISOString(date) + ']');
-
-      function shimToISOString (date) {
-        if (date.toISOString) {
-          return date.toISOString();
-        } else {
-          return toISOString(date);
-        }
-      }
+      expect(stringify(date)).to.equal('[Date: ' + date.toISOString() + ']');
     });
 
     it('should return invalid Date object with .toString() + string prefix', function () {