--- /dev/null
+var redefine = require('../internals/redefine');
+
+var DatePrototype = Date.prototype;
+var INVALID_DATE = 'Invalid Date';
+var TO_STRING = 'toString';
+var nativeDateToString = DatePrototype[TO_STRING];
+var getTime = DatePrototype.getTime;
+
+// `Date.prototype.toString` method
+// https://tc39.github.io/ecma262/#sec-date.prototype.tostring
+if (new Date(NaN) + '' != INVALID_DATE) {
+ redefine(DatePrototype, TO_STRING, function toString() {
+ var value = getTime.call(this);
+ // eslint-disable-next-line no-self-compare
+ return value === value ? nativeDateToString.call(this) : INVALID_DATE;
+ });
+}