date to timestamp javascript

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

1const ts = () => Math.floor(new Date().getTime() / 1000);

1var timestamp = 1607110465663
2var date = new Date(timestamp);
3console.log(date.getTime())
4console.log(date)

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

1function getUnixTime() {
2  return (Date.now() / 1000) | 0;  
3}

1function toTimestamp(strDate){
2   var datum = Date.parse(strDate);
3   return datum/1000;
4}
5alert(toTimestamp('02/13/2009 23:31:30'));
6