Date & Time Converter Native - Erick Vasilev

time.js

 Date.prototype.addHours = function(h) {
          this.setTime(this.getTime() + (h*60*60*1000));
          return this;
 }
 const singapore_time = new Date().addHours(8);   // GMT +8
 const date_time = singapore_time.getTime();
 const current_timestamp = singapore_time.getTime().toString();
 const date_to_utc = ( new Date(date_time)).toUTCString();
 const utc_to_epoch = Date.parse(date_to_utc);

 console.log(date_to_utc) // Tue, 22 Dec 2020 09:38:28 GMT

 console.log(utc_to_epoch) // 1608629908000
 console.log(current_timestamp)