System Time
How to set the System Time
System clock:
date
The hardware clock can be set from the system clock and vice versa:
hwclock --systohc
hwclock --hctosys
To set the hardware clock directly (the argument must be in local time, even if you keep your hardware clock in UTC.):
hwclock --set --date="YYYY-MM-DD hh:mm:ss"
e.g.
hwclock --set --date="2012-08-18 18:33:00"