While time clocks are certainly better than handwritten or paper timesheets, they typically only record punches or timestamps. Someone still needs to calculate the hours worked, know how to apply the pay rules and enter the time into payroll. With cloud-based time and attendance software, a smart time clock records the information, calculates the total hours immediately and sends them to payroll automatically. ADP time clocks also offer biometric identification, which prevents employees from clocking in or out for each other, also known as "buddy punching."