node get unix timestamp

var currentTimeInSeconds=Math.floor(Date.now()/1000); //unix timestamp in seconds
var currentTimeInMilliseconds=Date.now(); // unix timestamp in milliseconds

var d = new Date();
d.setDate(d.getDay() - 1);
d.setHours(0, 0, 0);
d.setMilliseconds(0);
console.log(d/1000|0)

Math.floor(new Date() / 1000) // in seconds