Issue #8376 has been updated by naruse (Yui NARUSE). Status changed from Open to Rejected Time#utc is destructive method. Use dup if you want a copy. ---------------------------------------- Bug #8376: utc method changes original time object https://bugs.ruby-lang.org/issues/8376#change-39177 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/