In addition to managing and approving daily timesheets, it is also possible to install an Odoo HR application that will manage holidays, leave, and other information related to employee time off. When we installed the timesheet module, Odoo automatically installed Leaves as a dependency. You can confirm it is installed just by going to Apps and looking at it:
The primary purpose of the Leaves hr_holidays application is to provide an easy mechanism for employees to request leave and for their managers to approve or deny the request.