diff --git a/test/ruby/test_time.rb b/test/ruby/test_time.rb
new file mode 100644
index 0000000000..bcb480def2
--- /dev/null
+++ b/test/ruby/test_time.rb
@@ -0,0 +1,24 @@
+require 'test/unit'
+
+class TestTime < Test::Unit::TestCase
+  def test_time_add()
+    assert_equal(Time.utc(2000, 3, 21, 3, 30) + 3 * 3600,
+                 Time.utc(2000, 3, 21, 6, 30))
+    assert_equal(Time.utc(2000, 3, 21, 3, 30) + (-3 * 3600),
+                 Time.utc(2000, 3, 21, 0, 30))
+  end
+
+  def test_time_subt()
+    assert_equal(Time.utc(2000, 3, 21, 3, 30) - 3 * 3600,
+                 Time.utc(2000, 3, 21, 0, 30))
+    assert_equal(Time.utc(2000, 3, 21, 3, 30) - (-3 * 3600),
+                 Time.utc(2000, 3, 21, 6, 30))
+  end
+
+  def test_time_time()
+    assert_equal(Time.utc(2000, 3, 21, 3, 30)  \
+                -Time.utc(2000, 3, 21, 0, 30), 3*3600)
+    assert_equal(Time.utc(2000, 3, 21, 0, 30)  \
+                -Time.utc(2000, 3, 21, 3, 30), -3*3600)
+  end
+end