From ThisBlueWiki
If you're using the FeedWordPress plugin for WordPress to feed RSS news into your Wordpress blog, you might have problems with posts being dated in 1969 or 1970. This may happen when your site is running PHP 5. If you are having problems with posts from FeedWordPress being dated 1969 or 1970, you can likely fix it very easily.
- Use the plugin editor in WordPress, or otherwise edit feedwordpress.php.
- Replace every instance of
@parse_w3cdtf and parse_w3cdtf with strtotime.
That's it.
FeedWordPress is a great aggregator plugin for WordPress. This and the permalink comment problem are the only problems I've had with it. I'm still working on the second one (where if you set permalinks to point to the original web site, comment links point there too, breaking local comments on articles aggregated by FeedWordPress).