Because the prestashop hook is under add to cart button and because I didn’t wanted to alter any core files the default position of the product delivery calendar is under add to cart.

The good news is that’s very easy to change it’s position, open themes/default-bootstrap/product.tpl and move
{if isset($HOOK_PRODUCT_ACTIONS) && $HOOK_PRODUCT_ACTIONS}{$HOOK_PRODUCT_ACTIONS}{/if}<strong></strong>

just bellow:
<div class="box-cart-bottom"></div>

Posted in: Prestashop per product delivery date