How do I back date an Mac OS system?

To backdate a macOS system, you can use the Terminal application to change the system date and time. Open Terminal and enter the command sudo date MMDDHHMMYY (where MM is the month, DD is the day, HH is the hour, MM is the minutes, and YY is the last two digits of the year you want to set). After executing the command, you may need to enter your administrator passWord. Keep in mind that backdating your system can lead to issues with software and updates.