Just remove the global. Refer to the modified script below:

var counttest = Class.create();

counttest.prototype = Object.extendsObject(AbstractAjaxProcessor, {

      counttest: function() {

              gs.info ('AAAA:This script is executing');

              var gr = new GlideRecord('incident');

              gr.query();

              if(gr.next())

                      { //Added this one

  gs.info("info");

              var datedif = gs.dateDiff(gr.sys_created_on,gs.nowDateTime(), false);

              gs.info('AAAA:'+datedif);

              return datedif;

      }

},

type: 'counttest'

});

Hi sidarth,

I have tried your script but now its giving following results.

which servicenow version are you using?

i am using Helsinki Version of Servicenow.

You might also want to check this article out:   One of the best breakdowns of client side GlideRecord and GlideAjax ServiceNow Pro Tips — GlideRecord & GlideAjax: Client-Side Vs. Server-Side