Unable to change date and time settings in Ubuntu 16.04 using command line
You can use timedatectl, it does all the necessary things for you itself.
First make sure NTP is not enabled:
sudo timedatectl set-ntp 0
then set the time:
sudo timedatectl set-time "2017-05-30 18:17:16"
make sure your timezone is correct too, e.g:
sudo timedatectl set-timezone Europe/Paris
and also use UTC if you are using localtime:
sudo timedatectl set-local-rtc 0