Synchronize with r15594.

test/intl/date-format/utils.js

Index: test/intl/date-format/utils.js
diff --git a/test/mjsunit/compare-nil.js b/test/intl/date-format/utils.js
similarity index 87%
copy from test/mjsunit/compare-nil.js
copy to test/intl/date-format/utils.js
index 0895a31fb80cbe697b678eaa1005926d7d65829f..535de15e9a2b4298cfc13d080b9fe620588f5b8e 100644
--- a/test/mjsunit/compare-nil.js
+++ b/test/intl/date-format/utils.js
@@ -25,12 +25,12 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax
+// Utility methods for date testing.
 
-function test(v) {
-  return (v == null);
+/**
+ * Returns date with timezone info forced into PDT.
+ */
+function usePDT(dateString) {
+  var removedTZ = dateString.replace(/(\+|-)\d{4}/, '-0007');
+  return removedTZ.replace(/\(.*?\)/, '(PDT)');
 }
-assertFalse(test(true));
-assertFalse(test(true));
-assertTrue(test(null));
-assertTrue(test(null));