wordpress rss cache

This is a little off topic but wordpress RSS seems to cache things for 12 hours and nobody seems to have a clue.

I set lifetime from 43200 to 3600 in wp-includes/class-feed.php.
Which will hopefully let me see the morning news in the morning… As it seems that I have to wait for the initial cache to time out.

I also left the following in the wp-config.php file just incase it was part of the solution

define('MAGPIE_CACHE_ON', 0);
define('MAGPIE_CACHE_AGE', 600);