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One way to change a field format is to backup content of database tables node__field_[your_field_name] and node_revision__field_[your_field_name] and flush them. This step will allow admin user(s) to change the field format. Then you can import the tables back to the database.

One way to change a field format is to backup content of database tables node__field_[your_field_name] and node_revision__field_[your_field_name] and flush them. This step will allow admin user(s) to change the field format, or to remove the field completely and create it again with the same system name. Then you can import the tables back to the database.

One way to change a field format is to find field.storage.node.field_[your field name] in config table of your Drupal's database, update this sequence:

"settings";a:1:{s:13:"datetime_type";s:8:"datetime";}

... into this:

"settings";a:1:{s:13:"datetime_type";s:4:"date";}

... and then clear the cache.

One way to change a field format is to backup content of database tables node__field_[your_field_name] and node_revision__field_[your_field_name] and flush them. This step will allow admin user(s) to change the field format. Then you can import the tables back to the database.

One way to change a field format is to backup content of database tables node__field_[your_field_name] and node_revision__field_[your_field_name] and flush them. This step will allow admin user(s) to change the field format. Then you can import the tables back to the database.

One way to change a field format is to find field.storage.node.field_[your field name] in config table of your Drupal's database, update this sequence:

"settings";a:1:{s:13:"datetime_type";s:8:"datetime";}

... into this:

"settings";a:1:{s:13:"datetime_type";s:4:"date";}

... and then clear the cache.