From c03afce001368b29eb929900075749b113a252c8 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Sun, 27 Sep 2015 06:13:04 -0700
Subject: [PATCH] If `@@toStringTag` is not present, use the old-school
 `Object#toString` test.

---
 index.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 1f3ee87..fe0d7ec 100644
--- a/index.js
+++ b/index.js
@@ -1,8 +1,7 @@
 'use strict';
 
 var getDay = Date.prototype.getDay;
-
-module.exports = function isDateObject(value) {
+var tryDateObject = function tryDateObject(value) {
 	try {
 		getDay.call(value);
 		return true;
@@ -10,3 +9,12 @@ module.exports = function isDateObject(value) {
 		return false;
 	}
 };
+
+var toStr = Object.prototype.toString;
+var dateClass = '[object Date]';
+var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
+
+module.exports = function isDateObject(value) {
+	if (typeof value !== 'object' || value === null) { return false; }
+	return hasToStringTag ? tryDateObject(value) : toStr.call(value) === dateClass;
+};