Error on setting scheduled opening or closing date

Can you verify you can reproduce this on a fresh Drupal site?

I installed a new Drupal 9.5.9 and tested with Webform 6.1.5 and 6.2.0-beta6 and the error was there.

I installed a fresh Drupal 9.5.9 and tested with Webform 6.1.5 and Webform 6.2.0-beta6. The error was there.

I installed a fresh Drupal 9.5.9 and tested with Webform 6.1.5 and Webform 6.2.0-beta6. The error was there.

I installed a fresh Drupal 9.5.9 and tested with Webform 6.1.5 and Webform 6.2.0-beta6. The error was there.

Can you reproduce the error on https://simplytest.me/ ?

My best guess is the datetime module is not installed. The attached patch is the simplest solution.

I have checked this issue with fresh Drupal 9.5.9 installation. Its working absolutely fine and able to save the form.

If you uninstall the core module Datetime then only this issue occurs. In that case above patch works fine.

Its very rare case that we uninstall the core module so I think that this bug is not appropriate.

I have checked and the Field type > Datetime is not installed, but I did not deactivate or unistall it. I used a routine form somebody else to install Drupal, which is where the problems of not installing Datetime maybe coming from. I have to check that.

After installing Datetime the error does no longer occur.

I don't know if it would make sense to have Datetime as a dependency in Webform.

Thank you very much for your help and time.

Webform using Drupal\datetime\Plugin\Field\FieldType\DateTimeItemInterface without checking for the DateTime module being installed is truly an undocumented module dependency, which does not seem necessary regarding the patch. The patch fixes that problem.

Automatically closed - issue fixed for 2 weeks with no activity.

Maybe the real solution would have been to add the module dependency to the DateTime module instead of adding it's own format, this should follow the format of the system, don't you think?