--- /dev/null
+'use strict';
+var $export = require('./_export')
+ , toObject = require('./_to-object')
+ , toPrimitive = require('./_to-primitive');
+
+$export($export.P + $export.F * require('./_fails')(function(){
+ return new Date(NaN).toJSON() !== null || Date.prototype.toJSON.call({toISOString: function(){ return 1; }}) !== 1;
+}), 'Date', {
+ toJSON: function toJSON(key){
+ var O = toObject(this)
+ , pv = toPrimitive(O);
+ return typeof pv == 'number' && !isFinite(pv) ? null : O.toISOString();
+ }
+});
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