A free Test2000.exe PC Clock testing program is supplied by Tom Becker's RighTime Company at www.RighTime.com. It also has a date fixer that is free for personal use.
IBM has a free tester at www.pc.ibm. com/year2000/evaluation.html
Viasoft also offers a free tester at www.viasoft.com.
The NSTL year tester is at www.nstl.com/html/ymark2000.htm