Disabling comments on posts based on date

I’m looking for a WordPress Plugin that allows me to disable comments on posts published before a certain date.

Basically it needs to do something like the line below, where the date should be something I can set.

UPDATE wp_posts SET comment_status = 'closed' WHERE post_date < '2011-01-01' AND post_status = 'publish';

I found the above query @ http://lrtm.nl/onv5OW (and here http://lrtm.nl/q8Ye4a), but is it available as a plugin?

Thanks!
Edde