javascript time ago

timeago.js

const timeAgo = (unixtime)=>{
  //no weeks
  const periods = ["second", "minute", "hour", "day", "month", "year", "decade"];
  const lengths = ["60","60","24","31","12","10"];
  //js returns in ms instead of s
  const now = Math.round(Date.now() / 1000);
  let difference = now - unixtime;
  let j=0;
  for(j = 0; difference >= lengths[j] && j < lengths.length-1; j++) {
    difference = difference / lengths[j];
    console.log(j,difference,lengths[j],lengths.length,difference >= lengths[j]);  
  }
  difference = Math.round(difference);
  if(difference != 1) {
      periods[j] += "s";
  }
  return difference + ' ' + periods[j] + ' ago';
}