Quick and Dirty show Date from feature

example.js

require(["esri/map", "esri/layers/FeatureLayer", "esri/tasks/query"], function (map, FeatureLayer, query) {
  var features = [/* assume a list of feature graphics will be assigned here soon */];
  // do stuff to assign maps, feature layers, etc. 
  // do stuff to assign features as a list of search results from a feature layer
  
  var importantDates = features.map(function (feature) {
    if (feature.attributes["ImportantDate"] !== null) {
      return new Date(feature.attributes["ImportantDate"]);
    }
  });
  
  var importantDatesAsStrings = importantDates.map(function (dateObj) {
    return [
      dateObj.getUTCMonth().toString(),
      dateObj.getUTCDate().toString(),
      dateObj.getUTCFullYear().toString()
    ].join("/");
  });
  
  // do something with the important dates as string.
});