title: Running a admin function at a certain time
body: <p>I'm currently working on an Android app that needs to randomly retrieve a user and match them up with another user once a certain date, which is stored in the database, arrives. Is there anyway I can somehow incorporate an admin function that does this into the app? I've tried looking at Google's App Engine and scheduling tasks with Cron, but that seems to only work for intervals or on specific dates.</p>