upgrade-checklist/datetime.md

DateTime in Mysql JCB Settings

In Joomla 3 we were used to setting the default for a datetime field to 0000-00-00 00:00:00. Since Joomla 4 (because of the mysql 8.0 requirement) that is no longer a valid default value. So it should be set to NULL.

To do so, you would change your field settings to these:

Data default = Other
Other Default = EMPTY
Null switch = NULL