Extend the z visa

I have a Z type, but due to unawareness of few changes.. my graduation certificate was needed to process the entry permit, but it took me some time to make it as it was lost, now i have the certification but need to make translation and other process, my entry permit expiry on 1st oct 2017, is it possible to extend my current Z type for few days so I can process other things for making renewals?
between i have been working in here since year 2005..