Timestamps for console.log()

timestamp.log.js

(function(){
  var log = console.log;
  console.log = function(){
    var timestamp = '['+new Date().toJSON().slice(14,-1)+']';
    if (arguments.length) {
      if (typeof arguments[0] === "string") {
        var args = Array.prototype.slice.call(arguments, 0);
        args[0] = "%s " + arguments[0];
        args.splice(1, 0, timestamp);
        return log.apply(console, args);
      } else {
        arr.unshift.call(arguments, timestamp);
        return log.apply(console, arguments);
      }
    }
  }
})();