TZInfo is a Ruby library that uses the standard tz (Olson) database to provide daylight-savings aware transformations between times in different timezones. The tz database is compiled into Ruby classes which are packaged in the release. No external zoneinfo files are required at runtime.
As a hacker (is it a universal feeling?) its always an ambiguous feeling to see someone else cross an item off your todo list, a little sense of a loss (I was looking forward to solving that problem) with a bit of glee (Now I get to solve more interesting problems!)