Date fail

This script fails:

const e = new Date("14 Jun 2017 00:00:00 PDT");
return e.getTime();
// Expected output: "1497423600000"
// Observed output: "-56423865600000"

Expected output is from https://runjs.app/play/#Y29uc3QgZSA9IG5ldyBEYXRl KCIxNCBKdW4gMjAxNyAwMDowMDowMCBQRFQiKTsK Y29uc29sZS5sb2coZS5nZXRUaW1lKCkpOwovLyBF eHBlY3RlZCBvdXRwdXQ6ICIxNDk3NDIzNjAwMDAw IgovLyBPYnNlcnZlZCBvdXRwdXQ6ICItNTY0MjM4 NjU2MDAwMDAiCiAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAg

Any ideas?