Extra info for When product is available

[slates]

A fill the When product is available field on the backend, for example 1-2 business days.

In the product.tpl I would like to add som emore information depends what was written in the available field.

 

So If available_now: 1-2 business days show the following information on the product page: You will get it before 12/10

 

If available_now 2-3 business days show this: You will get it before 12/15.

 

The date is dynamically, I have the script for that, only I would like to know how can I add this date to the available now.