* time.c (search_time_t): limit guess range by mktime if it is

availabe.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6049 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_time.rb

@@ -23,4 +23,14 @@ class TestTime < Test::Unit::TestCase
     assert_equal(Time.utc(2000, 3, 21, 0, 30)  \
                 -Time.utc(2000, 3, 21, 3, 30), -3*3600)
   end
+
+  def test_negative
+    begin
+      Time.at(-1)
+    rescue ArgumentError
+      return
+    end
+    assert_equal(-1, Time.utc(1969, 12, 31, 23, 59, 59).tv_sec)
+    assert_equal(-2, Time.utc(1969, 12, 31, 23, 59, 58).tv_sec)
+  end
 end