UTC to current time zone converter

UTCToMyDateTime.js

/*
 * Dojo AMD helper function to convert dates stored as UTC milliseconds from January 1, 1970 to a date/time format more fitting
 *   for current location. 
 * Reason: ArcGIS Server stores dates without times as midnight UTC. When those times are translated into real dates, 
 *   the browser often corrects the date for time zone differences, moving the date back several hours in the U.S.
 */
/* globals define */
define(function () {
   var oneDay = 24 * 60 * 60 * 1000;
    /** 
     * function to correct date values created when data source stores time in UTC.
     * @param {number | Date} value - either milliseconds from January 1, 1970, at 12:00:00 AM UTC, or Date object created by that criteria
     * @returns {Date} - date object corrected for current time zone, to reverse the natural correction browsers make to dates.
     */
    return function (value) {
      var val;
      if (value === undefined || value === null) { 
         return value;
      }
      val = typeof value.getTime === "function" ? value.getTime() : value;
      if (val % oneDay === 0) {
         return val + (new Date(val).getTimezoneOffset() * 60 * 1000);
      }
      return val;
    }
});