Odoo HR let your employees execute the most important task mobile, like sign in/out, make leave requests and see a history of attendances.
The employee can display an under- and overtime analysis for each timesheet. He see his duty hours based on his contract and his attendances hours and the diff (over- and under-time). This feature is only available, if Odoo module "Employee time clock" is installed.
Tested with Odoo V7 & V8