The time clock spits out a file. Someone pastes it into a spreadsheet, counts overtime by hand, and finds out after the limit is blown.
The system reads the clock, works out each person's hours, and warns you before the weekly cap is reached. It separates hours paid double from hours paid triple, and blocks any day that goes past twelve hours.
The record exports in the format the authority asks for, and paid hours reconcile against the payslip.