I’ve seen this posted already in the need help section, but it’s just a missing feature as far as I can see.
If a field’s type is date, Bubble offers only <, > and = in a dynamic expression, but not ≤ or ≥.
This means at the moment I have to merge the list of ‘less than’ dates with the list of ‘equal’ dates to get the ‘less than or equal to’ result.