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Are up-to-date Rails applications exposed to this issue?

Not 100% sure, but from what I know, Rails gets timezone handling right. Specifically, it leverages the https://github.com/tzinfo/tzinfo gem. So, correct me if I wrong, by performing `bundle update` you're all good?

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AFAIK you can use the tzinfo-data gem. Someone needs to manually update it though. So far it looks like it is still on the previous 2015g and not on 2016a that just got released: https://github.com/tzinfo/tzinfo-data

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