How to convert Date to timestamp using MomentJS?

Question

I used MomentJS to convert local date to UTC date using the following way:

Answer 1

moment().format("X"); // lowercase 'x' for milliseconds

var date = moment('2016-10-11 18:06:03').tz('Europe/Paris').format(),
    timestamp = moment(date).format("X");

$('#div1').text(date);
$('#timestamp').text(timestamp);