Include dates in a membership sign up form
I would recommend you to create a wordpress page 

For logged in member you should be able to find his contact ID and membership ID 

Using some PHP code you can select civicrm_membership table from civicrm database. Which will provide you with membership End date and you can use that to display to the member before renewing 

I guess this helps !!!

If you need more help please let me know 

Thanks