I checked that the BIOS is right in the time, and Windows is right, too. Both are EST time. The Linux time is wrong (4-hour later), but the timezone settting is EST time too. And If I revise the linux time, it will update hardware clock setting when I exit Linux. Then BIOS and WINDOWs clock will become wrong.
How can I disable the "update hardware clock" function?
Thanks a lot!