I searched for "time ago". Unfortunately, many time zones have "ago" in their name (such as "Chicago"). And it either ignored "ago" or it came up lots of irrelevant Time:: modules after those that had "time" and "ago" in their name.
Update: Since I couldn't stop after the first sentence, the post lost all value. Ignore it :)
Comment on Re^3: Showing the time difference in a natural format? (Time::Duration)