If you looking for a way to display the Last Modified Date of a page instead of or along with the Published Date then this tiny piece of snippet would register a function for that and you could easily show the last updated date on your pages.
/* Advanced Scripts Method to Add This Snippet */
/*
Title: PHP Snippet to Display Last Modified Date in WordPress
Type: PHP: Custom Code
Location: Plugins Loaded
Priority: 10
*/
function syncwin_display_last_modified_date( ) {
return get_the_modified_time('F j, Y');
}