Add default date_begin and date_end when creating an event. To avoid having weird time (like 11:23) we round date_begin to the nearest 30 minutes range and the date_end is set to the next day of date_begin. So for example if now is "2022-06-30 10:12" then: date_begin = "2022-06-30 10:30" and date_end = "2022-07-01 10:30" task-2845417 Part-of: odoo/odoo#91883