var Timezone = {

  replaceEpochWithLocalDate : function() {
        var date = new Date();
        var dateSpans = $$("span.dt")

        dateSpans.each(function(dt){

            var msFromEpoch = dt.innerHTML;
            date.setTime(msFromEpoch);
            dt.update(date.format("mmm d") + " at " + date.format("h:MMtt"));
            dt.removeClassName("hide");
            dt.removeClassName("dt");
        });
  }
};

document.observe("dom:loaded", Timezone.replaceEpochWithLocalDate);