time.c: [DOC] Time#localtime

* time.c: state that Time#localtime does nothing when nothing
  changes.  [ruby-core:87675] [Bug #14880]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63823 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/spec/ruby/core/time/localtime_spec.rb b/spec/ruby/core/time/localtime_spec.rb
index 56c9d37bc8..5592150ca2 100644
--- a/spec/ruby/core/time/localtime_spec.rb
+++ b/spec/ruby/core/time/localtime_spec.rb
@@ -90,6 +90,19 @@ describe "Time#localtime" do
 
       t.utc_offset.should == -18000
     end
+
+    it "does nothing if already in a local time zone" do
+      time = with_timezone("America/New_York") do
+        break Time.new(2005, 2, 27, 22, 50, 0)
+      end
+      zone = time.zone
+
+      with_timezone("Europe/Amsterdam") do
+        time.localtime
+      end
+
+      time.zone.should == zone
+    end
   end
 
   describe "with an argument that responds to #to_str" do