Clock in and Clock out management (Business)

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http://askubuntu.com – I am trying to encourage my boss to make the switch from an old card stamper to a computer running Ubuntu. We need a decent program that employee's can clock in during the day, clock out during lunch, and then back in. After the day is up we need it to give the EXACT hours/minutes the employee worked. If possible it would be nice if the app could sync with the computer in the office. Thanks in advance :) (HowTos)