Reproduce the issue
- Install Projects
- Create a project
- Create a task with a deadline
The deadline format is correct in the form view but not in the
kanban view.
Cause
In the kanban view, there is some code applied on the `date_deadline`
field to add a class when the deadline is near.
As it uses a `span` with a `t-esc`, the only way to get the date
is to do `record.date_deadline.raw_value` which return the raw
value of the datetime object (a big string with all the infos).
This commit creates a char field for the formatted date and uses it
only for the display.
OPW-2122928
closesodoo/odoo#40707
Related: odoo/enterprise#6832
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>