Add built-in Date.now fork back.

lodash.src.js

@@ -751,6 +751,7 @@
         nativeKeys = getNative(Object, 'keys'),
         nativeMax = Math.max,
         nativeMin = Math.min,
+        nativeNow = getNative(Date, 'now'),
         nativeParseInt = context.parseInt,
         nativeRandom = Math.random;
 
@@ -7280,9 +7281,9 @@
      * }, _.now());
      * // => logs the number of milliseconds it took for the deferred function to be invoked
      */
-    function now() {
+    var now = nativeNow || function() {
       return new Date().getTime();
-    }
+    };
 
     /*------------------------------------------------------------------------*/
 

test/index.html

@@ -85,6 +85,9 @@
 				setProperty(Array, '_isArray', Array.isArray);
 				setProperty(Array, 'isArray', noop);
 
+				setProperty(Date, '_now', Date.now);
+				setProperty(Date, 'now', noop);
+
 				setProperty(Object, '_keys', Object.keys);
 				setProperty(Object, 'keys', noop);
 
@@ -124,6 +127,11 @@
 				} else {
 					delete Array.isArray;
 				}
+				if (Date._now) {
+					setProperty(Date, 'now', Date._now);
+				} else {
+					delete Date.now;
+				}
 				if (Object._keys) {
 					setProperty(Object, 'keys', Object._keys);
 				} else {
@@ -148,6 +156,7 @@
 				setProperty(objectProto, 'propertyIsEnumerable', objectProto._propertyIsEnumerable);
 
 				delete Array._isArray;
+				delete Date._now;
 				delete Object._keys;
 				delete funcProto._method;
 				delete objectProto._propertyIsEnumerable;

test/test.js

@@ -419,6 +419,9 @@
     var _isArray = Array.isArray;
     setProperty(Array, 'isArray', _.noop);
 
+    var _now = Date.now;
+    setProperty(Date, 'now', _.noop);
+
     var _keys = Object.keys;
     setProperty(Object, 'keys', _.noop);
 
@@ -447,6 +450,7 @@
 
     // Restore built-in methods.
     setProperty(Array,  'isArray', _isArray);
+    setProperty(Date,   'now', _now);
     setProperty(Object, 'keys', _keys);
 
     setProperty(objectProto, 'propertyIsEnumerable', _propertyIsEnumerable);
@@ -626,7 +630,7 @@
       }
     });
 
-    test('should avoid overwritten native methods', 6, function() {
+    test('should avoid overwritten native methods', 7, function() {
       function Foo() {}
 
       function message(lodashMethod, nativeMethod) {
@@ -645,6 +649,13 @@
         }
         deepEqual(actual, [true, false], message('_.isArray', 'Array.isArray'));
 
+        try {
+          actual = lodashBizarro.now();
+        } catch(e) {
+          actual = null;
+        }
+        ok(typeof actual == 'number', message('_.now', 'Date.now'));
+
         try {
           actual = [lodashBizarro.keys(object), lodashBizarro.keys()];
         } catch(e) {
@@ -680,7 +691,7 @@
         }
       }
       else {
-        skipTest(6);
+        skipTest(7);
       }
     });
   }());