Wordpress-Date----Timestamp-Converter is a project mainly written in JAVASCRIPT and PHP, it's free.
Date / Timestamp converter plugin for Wordpress Author: Anthony Mills URL: http://www.development-cycle.com Version: 0.1 Date: 22nd July 2011
Small, simple plugin allowing the conversion of a unix timestamp to a date and vice versa. To use simply insert the [timestamp-converter] short tag into your page where you would like to place the converter.