This plugin allows WordPress to easily show customizable Erisian dates and time (decimal) instead of the standard Gregorian dates. No theme changes are required.
The Discordian Date Function plugin provides a widget which will display the current Erisian time and date according to the Discordian calendar. This functional based on the Discordian Date plugin by Dan Johnson.
Also you can add the shortcode [today_ddate] in posts or pages for show the Discordian date of today.