Background layui data table the transmission time stamp is converted to time format

layui.use(['table','jquery','form','util'], function(){
 var form = layui.form;
 var table = layui.table;
 var $ = layui.jquery;
 var util = layui.util;
 //第一个实例
 table.render({
 elem: '#demo'
 ,toolbar:'#toolbarDemo'
 ,limits:[1,2,4,6]
 ,limit:10
 ,cellMinWidth:90 
, URL: '/ Question / ShowQuestion' // number of data interfaces 
, Page: to true // Open sub pages 
, cols: [[ // table header 
{ Field: '', title: '', type: 'CheckBox', Fixed: 'left'} 
, { Field: 'ID', title: 'ID', Edit: to true} 
, { Field: 'question', title: ' SUMMARY ', Edit: to true} 
, { Field: 'create_time', title: ' Question Time ', Templet: function (D) { return util. toDateString (d.create_time * 1000);}, Edit: to true} 
, { Field: '', title: ' operation ', Toolbar: '#barDemo ', Fixed: ' right '} 
]] 
});