How to add last modified into header

Question

How to add last modified product date to product page header and last modified category date to category page header?

Answer 1

Add Below code on your header.phtml file.

<?php if(Mage::registry('current_product')): 
    echo Mage::registry('current_product')->getUpdatedAt(); 
endif; 
if(Mage::registry('current_category')):
    echo Mage::registry('current_category')->getUpdatedAt();
endif; 
?>