Incompatibility with SmartDate Hide Seconds feature

Problem/Motivation

Please, investigate this incompatibility.
https://www.drupal.org/project/smart_date/issues/3444283#comment-15581448 🐛 Hide seconds causes warning Fixed

Having an edit form with one core date range field and Smartdate widget (hide seconds on) and this module causes mentioned errors there.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes