Time clock solutions have been used for employee hours tracking as early as 1888. They are easy to use and highly effective. The actual mechanics of a time clock depend on the type. Traditional time clocks stamp a time and date on an employee time card to assist in keeping track of hours. Hours must then be calculated based on time of arrival and departure, assuming that the employee stamped in using the employee time clock for both. More advanced time clocks, like biometric time and attendance machines, log time in a similar way, but there are biological security measures to verify the identity of the employee clocking in and the machine automatically calculates the hours. Common biological features used on these machines are facial and fingerprint identification.