date --set="30 Dec 2019 11:45"
date +%Y%m%d -s "20191230"  
date +%Y%m%d%T -s "20191230 12:11:00"
timedatectl set-time '2019-12-30 11:45:00'

sudo date --set="30 Dec 2019 11:45" 
sudo date +%Y%m%d -s "20191230"  
sudo timedatectl set-time '2019-12-30 11:45:00'  (Mint)

Désactivation NTP  sudo timedatectl set-ntp 0
réactivation NTP  sudo timedatectl set-ntp 1