My system has a sleep mode feature, which I usually use it instead
of shutting down my entire computer when I be away for a long period. But I
found that when I use this feature within a logon screen and then log into
my account, the linux system clock drift 16 hours (4 hrs and AM -> PM or PM
-> AM), and this bug I got it within RH6.1, and I am very surprised that
this bug isn't found in older versions like RH5.2 . So I need a help for
fixing this bug.
Install the apmd package, that should fix it.