var event1 = new Date('July 1, 1999');
var event2 = new Date();
event2.setTime(event1.getTime());

console.log(event1);
// expected output: Thu Jul 01 1999 00:00:00 GMT+0200 (CEST)

console.log(event2);
// expected output: Thu Jul 01 1999 00:00:00 GMT+0200 (CEST)
// (note: your timezone may vary)