convert datetime to timestamp javascript

let unix_timestamp = 1549312452
// Create a new JavaScript Date object based on the timestamp
// multiplied by 1000 so that the argument is in milliseconds, not seconds.
var date = new Date(unix_timestamp * 1000);
// Hours part from the timestamp
var hours = date.getHours();
// Minutes part from the timestamp
var minutes = "0" + date.getMinutes();
// Seconds part from the timestamp
var seconds = "0" + date.getSeconds();

// Will display time in 10:30:23 format
var formattedTime = hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);

console.log(formattedTime);

function toTimestamp(strDate){ var datum = Date.parse(strDate); return datum/1000;}

var timestampInSeconds = Math.floor(Date.now()/1000);
var date = new Date(timestampInSeconds*1000);//convert unix timestamp (seconds from epoch) to javascript date

var date = new Date("2016-07-27T07:45:00Z");
However, you can run into trouble when you do not provide the timezone explicitly!