We don't have the information about when someone started following you
available on the API. We do allow you to opt-in to new follower
notification emails though, so you could receive those going forward
to keep a record of when different users followed you.
What does happen is the friends and followers lists return users in
the order they followed you (followers), or you followed them
(friends), with the most recent being first. Whilst you cannot obtain
the time the connection was created, you can get the order.
I hope that answers your question,
Matt
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Matt Harris
Developer Advocate, Twitter
http://twitter.com/themattharris