post_request(): add full time-string

I’m coding a site and I need to show all posts after a specific date.
Right now there is no way to do this with query_posts()
I’m almost there to create it with a custom query but I would like this to exist in the API.

right now query_posts allows following time options:
hour, minute, second ,day ,monthnum, year
a full-time string (Y-m-d H:i:s) as exists in the posts table of the database would make the archives much more flexible (select posts between two dates etc).