Looking at the YouTube API v3 Search documentation, it states that the order parameter is used to control ordering of API response resource results. However, when attempting to order by date, I'm not receiving the results in reverse chronological order as specified. In fact, they are not in any order whatsoever.
API Request with order date using API Explorer UI:

Is there some other way I should be requesting for results to be ordered by the time they were published on YouTube? Is there a bug in the handling of the order API parameter?