Get time from Ubuntu's time server:

ntpdate ntp.ubuntu.com

Select time zone:

tzselect

Use the following commands to read the hardware clock, read the hardware clock localtime, update it, update it to localtime, update the system clock from the hardware clock:

/sbin/hwclock
/sbin/hwclock --localtime
/sbin/hwclock --systohc
/sbin/hwclock --systohc --localtime
/sbin/hwclock --hctosys
/sbin/hwclock --hctosys --localtime