Before this commit: - The existing of two dates behaving as and end date for project_task (date_deadline and planned_date_end) is confusing. In this commit: - The main goal is to simplify the interface by having one field/widget that acts as both the deadline and the end date, instead of having two separate fields. So we removed planned_date_end (changes can be seen in the enterprise related pr (link at the end) and changed the date_deadline type from date to datetime in project_task and report_project_task_user Related PRs: Enterprise: odoo/enterprise#40866 task-3084978 closes odoo/odoo#120953 Related: odoo/upgrade#4654 Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>