VoterEligibilityPage.php defines date fields in the form that populates the voter eligibility list automatically. The code defines the maximum allowed value for these fields to be yesterday. However, if you leave them blank and submit the form, the value that is populated for them (based on a blank input for an HTMLDateTimeField) will be today's date. If you submit the form at this stage, you will get a warning about the date being out of range.

This is inconsistent. Ideally, the default value for these fields should both "yesterday" because today's data (whether it is edit counts or registration dates) is always incomplete.