The system can be auto calculated.
Go to menu

Reports > advance > filter for date and time and click on the type that you want to check.
Late
OT

You can also check for whom that come before working time by choosing Late tab.
Ex. want to check that who is come between 5am. - 8.30 am. In the morning?
The system will check for people who clock in before working time during that time you have filtered.