Debian set system time

To set the system time in Linux is very easy; the date command allows setting of the system date and time. This does not affect any time kept by a hardware clock, the hwclock command is needed for that. The BeagleBone does not come with a hardware clock, however, so the hwclock command fails out gracefully.

sudo date --set 1998-11-02
sudo date --set 21:08:00

Reference link:

https://wiki.debian.org/DateTime