Steps to reproduce:
- Go to Special:Log
- Put your name in performer field. Hit show. This causes you to go to the page https://meta.wikimedia.org/wiki/Special:Log?type=&user=Bawolff&page=&wpdate=0000-00-00&tagfilter=
- The date field is now set to -0001-11-30. This is invalid. When i change something else and hit submit i get a pre-submit client side error