date

http://www.cyberciti.biz/faq/howto-set-date-time-from-linux-command-prompt/

OR
# date --set="2 OCT 2006 18:00:00"

You can also simplify format using following syntax:
# date +%Y%m%d -s "20081128"

Linux Set Time

To set time use the following syntax:
# date +%T -s "10:13:13"

To show UTC seconds since 1970-01-01
# date +%s

Set timezone...
$ tzselect

月日時分秒
date +%m%d%H%M%S