cmos/bios time?

[jekillen]

I have installed a FreeBSD system on Asus motherboard and have needed to set time
in bios/cmos. But:
I set the time to hours: 11 and when I boot the system. the time shows up as 4 (instead of 11)
SO I get into the bios and set the hour to 23 (assuming a 24 hr clock) and the system comes up
showing 16
What is happening here?
I would use ntp server to set time but I don't yet have an internet connection for this system
Thanks for time and attention.
JK

[camerongray]

UNIX systems store the time in the BIOS as UTC, the OS then changes this based on the timezone (by adding/subtracting hours).  You should set the time through the OS itself or set the BIOS to the time in UTC rather than your local time.

[jekillen]

Actually, in the bios on this machine I do not see an option for specifying utc.
But what happened is that I had the minutes set wrong. When I set the minutes
to the correct value, the time showed up correct on reboot.

Thank you for your time and attention

[Tan]

Linux maintains two clocks: the hardware clock and the software clock. The battery driven hardware clock maintains the time while the computer is turned off. During the boot, Linux reads the hardware clock and sets the software clock to the value it retrieves.

I think that this article can help you: date command