Date parsing JSON

gistfile1.js

JSON._dateReviver = function (k,v) {
  if (v.length !== 24 || typeof v !== 'string') return v
  try {return new Date(v)} 
  catch(e) {return v}
}

JSON.parseWithDates = function (obj) {
  return JSON.parse(obj, JSON._dateReviver);
}

How about dateify? I've always thought stringify was weird so why not keep up the tradition?