One of my users managed to do this and I'm not sure how. Self-hosted version 15.
On the "Entries" page for the form, she created a filter. The top of her form has the usual blue bar at the top that says "Displaying filtered entries. Edit or Clear Filter
Directly under that is a message that says:
SQL: [363] select count(*) total_row from (select id, id as row_num, date_created, date_updated, element_1_1, element_1_2, element_2, element_3, element_5, element_7 from ap_form_29021 A WHERE (date_created IS NULL OR date_created = '' OR date_created = 0000-00-00) AND status=1) B Params: 0 Query Failed: SQLSTATE[HY000]: General error: 1525 Incorrect DATETIME value: ''
I don't see the error on the Entries page in my account, and I haven't heard any other users report the issue.
She tried logging out and back in, and clearing her cookies. I tried removing her access to the form entries and then adding her back, but the error remains. Any ideas?