Odoo now provides a standard default work calendar instead of relying on demo data or hidden fallback assumptions. This makes scheduling-related features more consistent across HR, payroll, leave management, contracts, CRM, stock calendars, and automation.

Task: https://www.odoo.com/web#id=30782&view_type=form&model=project.task&action=333&active_id=248&menu_id=4720