diff --git a/test/test_value_converter_factory.rb b/test/test_value_converter_factory.rb
index a5f84c1..0d69eec 100644
--- a/test/test_value_converter_factory.rb
+++ b/test/test_value_converter_factory.rb
@@ -269,6 +269,21 @@ def test_time
           ).create_converter
           assert_equal nil, converter.call(nil)
           assert_equal "00:03:22.000000", converter.call("00:03:22")
+          assert_equal "15:22:00.000000", converter.call("3:22 PM")
+          assert_equal "03:22:00.000000", converter.call("3:22 AM")
+          assert_equal "15:22:00.000000", converter.call("15:22")
+          assert_equal "03:22:01.000000", converter.call("03:22:01")
+          assert_equal "10:00:00.000000", converter.call("2024-07-24 10:00")
+
+          # Users must care of BQ datetime format by themselves with no timestamp_format
+          converter = ValueConverterFactory.new(SCHEMA_TYPE, 'TIME').create_converter
+          assert_equal nil, converter.call(nil)
+          assert_equal "00:03:22", converter.call("00:03:22")
+          assert_equal "15:22:00", converter.call("3:22 PM")
+          assert_equal "03:22:00", converter.call("3:22 AM")
+          assert_equal "15:22:00", converter.call("15:22")
+          assert_equal "03:22:01", converter.call("03:22:01")
+          assert_equal "10:00:00", converter.call("2024-07-24 10:00")
         end
 
         def test_record