WordPress.org

1. Download the plugin.
2. Unzip the contents of the downloaded file to the /wp-content/plugins/ directory of your Wordpress installation.
3. Log in to your Wordpress dashboard and activate the wpdaysago plugin that should now be visible in the list.
4. You can now insert <? wpdaysago(); ?> anywhere in The Loop in your Wordpress theme.

The wp-days-ago plugin takes one parameter; the time zone offset between your Wordpress time zone settings and the server your Wordpress installation is running on. In my case I write everything in Central European Time, but the server is located in Sydney, Australia. That’s a -8 hour time zone offset from the server to my local time, and to get things right, I have to use -8 as the time zone offset parameter, like this: <? wpdaysago(-8); ?>.

Plugin URL: http://www.vegard.net/archives/1476/