Javascript - Time Since function

gistfile1.js

function timeSince(date) {
  var seconds = Math.floor(((new Date().getTime()/1000) - date)),
  interval = Math.floor(seconds / 31536000);
  
  if (interval > 1) return interval + "y";
  
  interval = Math.floor(seconds / 2592000);
  if (interval > 1) return interval + "m";
  
  interval = Math.floor(seconds / 86400);
  if (interval >= 1) return interval + "d";
  
  interval = Math.floor(seconds / 3600);
  if (interval >= 1) return interval + "h";
  
  interval = Math.floor(seconds / 60);
  if (interval > 1) return interval + " m";
  
  return Math.floor(seconds) + "s";
}