I'm not sure if these implement the same interface, but ruby-tzfile has the same goal as libtzinfo-ruby, and reads its time zones from the system tzdata interface
http://www.a-k-r.org/ruby-tzfile/index.html -- Chanoch (Ken) Bloom. PhD candidate. Linguistic Cognition Laboratory. Department of Computer Science. Illinois Institute of Technology. http://www.iit.edu/~kbloom1/
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