code: function _datePlusMinutes(date, minutes) {
    var minutesInMilliSeconds = minutes * 60 * 1000;
    var epochTime = date.getTime() + minutesInMilliSeconds;
    return new Date(epochTime);
  }
docs: Given a Date object adds the minutes parameter and returns a new Date object.
  @private
  @static
  @memberOf WSTrustRequest
  @param {Date}     date      A Date object.
  @param {Number}   minutes   The number of minutes to add to the date parameter.
  @returns {Date}             Returns a Date object.