function time () {
  // http://kevin.vanzonneveld.net
  // +   original by: GeekFG (http://geekfg.blogspot.com)
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: metjay
  // +   improved by: HKM
  // *     example 1: timeStamp = time();
  // *     results 1: timeStamp > 1000000000 && timeStamp < 2000000000
  return Math.floor(new Date().getTime() / 1000);
}