I'm writing a webapp that uses the YouTube Code API to do specific types of searches. In this case, I'm trying to search for all videos that match a query, and which were uploaded between two dates. [This document](http://code.google.com/apis/youtube/2.0/developers_guide_protocol.html#Displaying_a_list_of_videos) says I can use published-min and published-max parameters, while [this one](http://code.google.com/apis/gdata/docs/2.0/reference.html) says I can use updated-min and updated-max. 

Both of these parameter sets cause YouTube to return an error:

* [published-min](http://gdata.youtube.com/feeds/videos?q=test&published-min=2011-04-05T00:00:00-06:00&published-max=2011-04-14T00:00:00-06:00&max-results=50) returns "This service does not support the 'published-min parameter"
* [updated-min](http://gdata.youtube.com/feeds/videos?q=test&updated-min=2011-04-05T00:00:00-06:00&updated-max=2011-04-14T00:00:00-06:00&max-results=50) returns "This service does not support the 'updated-max' parameter"
* [With neither](http://gdata.youtube.com/feeds/videos?q=test&max-results=50) returns a correct result set.

How can I limit my result set to hits within a specified date range?