1var timestamp = new Date().getTime();

1var currentTimeInSeconds=Math.floor(Date.now()/1000); //unix timestamp in seconds
2var currentTimeInMilliseconds=Date.now(); // unix timestamp in milliseconds

1new Date().getTime()
2
3new Date().valueOf()

1const currentTimeInMilliseconds=Date.now(); // unix timestamp in milliseconds

1const currentTimeInSeconds=Math.floor(Date.now()/1000); //unix timestamp in seconds