I have finished development of a PHP Class for easily adding date/time selectors to any (X)HTML form. The code and description have been published on the PHP Classes website.

Direct link: http://jbettigole.users.phpclasses.org/package/5018-PHP-Generate-select-inputs-to-choose-dates-and-times.html

The intended use for this class is to add date/time selectors to forms using the PHP Date() function syntax.