diff --git a/ddatefunc.php b/ddatefunc.php
index 18d1675..40c160b 100644
--- a/ddatefunc.php
+++ b/ddatefunc.php
@@ -256,10 +256,10 @@ class Discordian_Date_Widget extends WP_Widget {
   }
 }
 
-function get_the_ddate_post($content, $format) {
+function get_the_ddate_post($content, $format = null) {
   return get_ddate($content, $format, "get_the_date"); }
 
-function get_the_ddate_comment($content, $format) {
+function get_the_ddate_comment($content, $format = null) {
   return get_ddate($content, $format, "get_comment_date"); }
 
 function register_ddatefunc_widget() {