The purpose of timesheets/clock cards is not only to record overtime. “Clocking” in and out monitors employees’ time-keeping – it may be important in some businesses/organisations that staff start their shifts/work on time.
For businesses that provide services with “chargeable hours” – e.g. accountancy firms, lawyers, etc, the timesheet is extremely important for charging billable hours to clients – and monitoring non-chargeable hours.