If it isn't correct we need to know how to manage the problem. A PC which automatically maintains the current date. PCs with dead batteries or with old technology that do not keep the date will not be able to do this. A PC which can boot from a diskette disk. A DOS system boot disk.
Stickers are available to clearly document the results of the testing.
A watch or clock to keep time is desirable. If the PC is on, power off as you normally do. Wait 20 seconds to protect your PC's hardware. You should have a DOS prompt and not in Windows, otherwise the PC does not boot from the disk drive and you need to obtain technical assistance before proceeding. Power off the computer and wait more than 2 minutes so the date has time to roll over to January 1, 2000.