Steps to replicate the issue:
Run a script which is using get_closest_memento_url without giving a 'when' parameter e.g. weblinkchecker
What happens?:
>>> (10000) Myriostos <<< WARNING: Http response status 403 *[[(10) Hygiea]] links to https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1085085/ - Forbidden. WARNING: get_closest_memento_url(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1085085/) failed: type object 'datetime.datetime' has no attribute 'datetime' ** Logging link for deletion.