How to retrieve the knowledge articles based on the valid to

[GBS]

I’m using the background script below to get the articles that will expire in 2 months from now, I have tried with encoded query but none are working. Can anyone help me with this

var gr = new GlideRecord('kb_knowledge');

gr.addQuery('workflow_state', 'published');

gr.addQuery('kb_knowledge_base.title', 'HR');

gr.addEncodedQuery();

gr.query();

if (gr.hasNext()) {

    gs.print('Articles expiring after the end of this month:');

    while (gr.next()) {

        var kbName = gr.kb_knowledge_base.getDisplayValue();

        gs.print('Article Number: ' + gr.number);

        gs.print('Title: ' + gr.short_description);

        gs.print('Knowledge Base: ' + kbName);

        gs.print('Expiration Date: ' + gr.valid_to);

        gs.print('----------------------------------');

    }

} else {

    gs.print('No articles found expiring after the end of this month.');

}

[GBS]

@Mark Manders I'm getting the past date articles but I want future articles that to exactly 2 months and not more than this