Another Unusual Project (for admin) and anyone who likes to help

I have this project about attendance of employee (not talking about DTR but almost alike) In our school, they have this fingerprint tracker for their attendance. Fingerprint tracker really cost a lot. So I think of a way how to transform fingerprint tracker to a log in system (with username and password) connected to the database (including time in and time out and total number of hours worked). In this project, they have to log in for them to be able to time in and log out for their time out. My main problem here is: How to display the name who log in (name of an employee)? How can I make an account of their own? How to display it on database? How to display the time in after logging in and time out after logging out and the total number of hours they worked? I really ran out of idea how to do it. I already have a database where to put their information. We are not recommended to use a Time Card to compute the payroll or DTR system. Really appreciate for your response