I already installed the Order Delivery Date extension, but the date calendar doesn't appear when clicked in the frontend.
We assume that the root of the issue is due to a conflict related to the css style between your theme and our Order Delivery Date extension.
In order to fix that conflict, please edit this file: skin/frontend/base/default/css/bss/orderdeliverydate.css - add code below:
For more information about product, please refer Magento Order Delivery Date page.
If you need any further assistance, please feel free to contact us.
Please visit our site for more useful Magento 1 Extensions: https://bsscommerce.com/extensions.html