Issue #8376 has been updated by matz (Yukihiro Matsumoto). I admit this is a bad design, but changing it introduces incompatibility. We don't consider it as a bug (thus we rejected). Submit feature request instead, if you really want to change. Maybe fixed in the future, if we can provide proper migration path. Matz. ---------------------------------------- Bug #8376: utc method changes original time object https://bugs.ruby-lang.org/issues/8376#change-39179 Author: arjan0307 (Arjan Diepenbroek) Status: Rejected Priority: Normal Assignee: Category: Target version: ruby -v: 1.8.7, 1.9.3, 2.0.0 Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN The utc method changes the original time object when called. For example when on a system with a CET timezone. t = Time.new(2013) t.zone # CET t.utc t.zone # UTC -- http://bugs.ruby-lang.org/