Delivery Date by Postal Code

Hello there,

I'm looking for help with regards to delivery and post codes.

My client has several post code routes which have different schedules.
I'm looking for a module that will allow customers to check if deliveris are made to their post code.

If my client delivers to their post code, they can then choose from specific delivery dates available. If the post code does not fall within my clients delivery route, a message pops up informing the cusomter that my client currently does not deliver to their post code area.

I suppose it's like the "book your slot" option that is found on supermarket online shopping sites - only I need specific dates available for certain post codes.

Is there a way to do this? Any help would be much appreciated.
Many thanks

This is a postal code extension
http://www.opencart.com/index.php?route ... mdevlper18

I can customize this with slot, which will be chargeable.
Email : imdevlper18@gmail.com