I using Red hat linux, date of system is not exact. sometime I issue the command date mmddhhss to edit the system date. Anybody can tell me how to resolve this problem. Thanks anyway.

check out wether you CMOS bettery ( the small cell on your mother board to supply power to BIOS when computer is turned off so, BIOS can keep save his settings including System Clock) is in working condition or has expired. Mostly this problem is caused by an empty CMOS battery. By putting a new CMOS battery your BIOS will not again forget the system time when u'll start ur computer next time.

I had a problem similar to this, and this is how I remember fixing it. I'm not sure if the commands are exact.

To my knowledge, or at least on my computer, the date command only adjusts the date or time for that session. I had to syncronize it with the hardware clock to get it to change permanently. "hwclock --systohc" I believe was the command I used (after running date to change the system clock).

Also, you can change the hardware clock (hwclock) directly by the "hwclock --set --date="05/18/2007 18:00:00" and then "hwclock --hctosys", which should syncronize it with the system clock.

Cheers.