Read the following and make sure thet your current time-attendance system's infrastructure will work with the new system that you may install.
Time Card Systems Compatibility
Time Card Systems Compatibility
One of the most common and most costly mistakes buyers make is failing to be sure their current time card systems infrastructure will work with the new system. You can quickly choose any system that does not work with your current operating system, databases, and enterprise applications, and a skin-deep analysis of the time card systems requirements is not enough.

Any seriously considered vendor should be able to demonstrate its compatibility with your company's overall environment. Time card software should be compatible with the data input devices you want to use, your current IT applications, your HR soft, and your payroll services.
montage_01
If you plan to set rules in your time card system, go through your company handbook and see if the vendor can adjust to your time and attendance-related rules. Also you should ask about compatibility with your payroll service to ensure seamless integration.

Don’t buy time card systems based on the "upcoming" or "next-generational" platforms from a vendor. Quite true, understanding a vendor's future plans is an important factor in your investment decision, remember that you are purchasing a car to drive today, not tomorrow. If they do not fully integrate with your time card systems today, a vendor should offer a clear and workable plan for creating a working system that addresses any conflicts you face, with a timetable for performance.

But you will find that most sellers offer time card systems that are compatible with typical industry solutions. Most software vendors support the standard interfaces for data entry systems and payroll services, and are flexible enough to accommodate common business rules. The vendor should be able to prove the system is secure from tampering from internal and external parties. Most of them offer encrypted file transmission and other basic software security measures.