timestamp.js

function timeStamp() {
    var now = new Date(),
        date = [ now.getMonth() + 1, now.getDate(), now.getFullYear() ],
        time = [ now.getHours(), now.getMinutes(), now.getSeconds() ];
    
    // Leftpad seconds with 0 
    for ( var i = 1; i < 3; i++ ) {
        if ( time[i] < 10 ) {
            time[i] = "0" + time[i];
        }
    }

    // Return the formatted string
    return date.join("/") + " " + time.join(":");
}

timestampModule.js

// Revisited in 2018
export default () => {
  const now = new Date()
  const date = [
    now.getMonth() + 1,
    now.getDate(),
    now.getFullYear()
  ]
  let time = [
    now.getHours(),
    now.getMinutes(),
    now.getSeconds()
  ]

  // Leftpad time units with 0
  time = time.map(t => t < 10 ? '0' + t : t)

  // Return the formatted string
  return `${date.join('/')} ${time.join(':')}`
}