[Fix] use has-tostringtag to behave correctly in the presence of symbol shams

See #22

Author: ljharb

index.js

@@ -12,7 +12,7 @@ var tryDateObject = function tryDateGetDayCall(value) {
 
 var toStr = Object.prototype.toString;
 var dateClass = '[object Date]';
-var hasToStringTag = typeof Symbol === 'function' && !!Symbol.toStringTag;
+var hasToStringTag = require('has-tostringtag/shams')();
 
 module.exports = function isDateObject(value) {
 	if (typeof value !== 'object' || value === null) {

package.json

@@ -31,6 +31,9 @@
 		"@@toStringTag",
 		"Date object"
 	],
+	"dependencies": {
+		"has-tostringtag": "^1.0.0"
+	},
 	"devDependencies": {
 		"@ljharb/eslint-config": "^17.6.0",
 		"aud": "^1.1.5",

test/index.js

@@ -2,7 +2,7 @@
 
 var test = require('tape');
 var isDate = require('../');
-var hasSymbols = typeof Symbol === 'function' && typeof Symbol.iterator !== 'undefined';
+var hasToStringTag = require('has-tostringtag/shams')();
 
 test('not Dates', function (t) {
 	t.notOk(isDate(), 'undefined is not Date');
@@ -19,7 +19,7 @@ test('not Dates', function (t) {
 	t.end();
 });
 
-test('@@toStringTag', { skip: !hasSymbols || !Symbol.toStringTag }, function (t) {
+test('@@toStringTag', { skip: !hasToStringTag }, function (t) {
 	var realDate = new Date();
 	var fakeDate = {
 		toString: function () { return String(realDate); },