How to set format in datetime-local field in CakePHP 4?

Its possible what you’re looking for is no longer handled by a viewhelper.

Check this thread, which is sort of on topic: -

as it may have the answer for you. Note that’s for display, not sure if input draws from the same settings.

(If you are checking config/app.php also check config/app_local.php as that has precedence.)