our strftime doesn't error out with %-d but just outputs -d rather
than doing whatever this test wants

Index: tests/test_parser.py
--- tests/test_parser.py.orig
+++ tests/test_parser.py
@@ -29,6 +29,8 @@ try:
 except ValueError:
     pass
 
+if sys.platform.startswith('openbsd'):
+    PLATFORM_HAS_DASH_D = False
 
 @pytest.fixture(params=[True, False])
 def fuzzy(request):