time.c: added Time::TM#+ and Time::TM#-

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 9 deletions

diff --git a/test/ruby/test_time_tz.rb b/test/ruby/test_time_tz.rb
index 328fde48fc..97ec3d08a6 100644
--- a/test/ruby/test_time_tz.rb
+++ b/test/ruby/test_time_tz.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: false
 require 'test/unit'
 require '-test-/time'
-require 'time'
 
 class TestTimeTZ < Test::Unit::TestCase
   has_right_tz = true
@@ -493,18 +492,12 @@ End
       @offset = offset
     end
 
-    def add_offset(t, ofs)
-      Time.utc(*Time.send(:apply_offset, *t.to_a[0, 6].reverse, ofs))
-    rescue => e
-      raise e.class, sprintf("%s: %p %+d", e.message, t, ofs)
-    end
-
     def local_to_utc(t)
-      add_offset(t, +@offset)
+      t - @offset
     end
 
     def utc_to_local(t)
-      add_offset(t, -@offset)
+      t + @offset
     end
 
     def abbr(t)