layui.define(['laytpl', 'jquery'], function (exports) {

  var $ = layui.jquery;

  var laytpl = layui.laytpl;

  laytpl.timeFormat = function (time) {

    time = time || new Date();

    return time.getFullYear() + "" + time.getMonth() + "" + time.getDate() ;

  };

});

<script type="text/html" id="dateTpl">

    {{ layui.laytpl.timeFormat() }}

</script>