datetime - javascript convert from epoch string to Date object

Question

var myDate = new Date();
var epoch = myDate.getTime(); //1318023197289 number of ms since epoch
var unixEpoch = Math.round(epoch/1000)

1. How do you convert epoch back to a Date object?
2. Can you also convert unixEpoch back to a Date object?

Answer 1

var date = new Date(1318023197289);

And, since unixEpoch is simply epoch / 1000, you can similarly multiply the argument in the constructor by 1000.