- <dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastpostmodified('GMT'), false); ?></dc:date>
- <admin:generatorAgent rdf:resource="http://wordpress.org/?v=<?php echo $wp_version ?>"/>
- <sy:updatePeriod>hourly</sy:updatePeriod>
- <sy:updateFrequency>1</sy:updateFrequency>
+ <dc:date><?php
+ $date = get_lastpostmodified( 'GMT' );
+ echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date ) : date( 'Y-m-d\TH:i:s\Z' );
+ ?></dc:date>
+ <sy:updatePeriod><?php
+ /** This filter is documented in wp-includes/feed-rss2.php */
+ echo apply_filters( 'rss_update_period', 'hourly' );
+ ?></sy:updatePeriod>
+ <sy:updateFrequency><?php
+ /** This filter is documented in wp-includes/feed-rss2.php */
+ echo apply_filters( 'rss_update_frequency', '1' );
+ ?></sy:updateFrequency>