Comment 8 for bug 1242501

It looks like iso8601 0.1.7 is uninstallable under Python 3.3 anyway, so I agree https://review.openstack.org/53156 may be a better choice in the near term. You're still likely to encounter this same behavior change in 0.1.8 so perhaps improving Glance to have a consistent behavior when the time part is omitted (regardless of support in the iso8601 package) would be your best option long-term?