Customer Checkout Feature

[Paul Perris]

Hello,

We supply party goods via the internet and need to meet clients party
dates - we have a box at checkout asking for the party date.

Would it be possible in some way to make the customer enter a valid party
date and the system check its within our standard delivery terms.

E.g customers orders a fancy dress wig for delivery in 24 hours - we don't
offer this sevice and we would like to block this when they enter the date
at point of order, when they click
checkout the systems say sorry you need to enter a valid party date.

Cheers,

Paul