Shift Delivery Date after PO Approval

Hi all,

I need to shift delivery date after PO last approval. Let me explain why;

PO created at 27.10.2015

Delivery Date is 30.10.2015

PO Approved at 30.10.2015 and printout sent to the vendor. Vendor delivered goods at 31.10.2015 which means after 1 day when he got the printout.

But if we look from PO side, vendor seems 1 day late. This cause problems in vendor evaluation.

Does anyone has suggestion on this?

Thanks in advance.