How do I change the hardware clock on linux redhat?

petulia3478

The hardware clock is the time & date held in the BIOS. The system time is the time set by the operating system.

# hwclock --set --date="9/20/09 15:45:05"

To show the current hardware date & time:

# hwclock
Wed 14 Oct 2009 14:23:32 BST  -0.000400 seconds

To set the system time to the hardware clock time:

# hwclock --hctosys
# hwclock
Wed 14 Oct 2009 14:26:17 BST  -0.000378 seconds
# date
Wed Oct 14 14:26:17 BST 2009