Internal Server Error when receiving Activities with an invalid DateTime property

[allouis]

If an activity is received which has an invalid DateTime property, for example the updated property, Fedify will throw an Internal Server Error - this can cause monitoring alerts to be triggered.

An example of malformed Activities can be found here:

https://socialwebfoundation.org/wp-json/activitypub/1.0/actors/0/outbox?page=1

They have an updated property like 2025-01-01 12:34:56 rather than 2025-01-01T12:34:56Z

I would expect that Fedify respond with a 400 or similar in this case