Time

Configuring time zone

timedatectl

sudo timedatectl set-timezone <your_time_zone>

tzdata

1. Replace the timezone in /etc/timezone file:

   echo <your_time_zone> | sudo tee /etc/timezone

2. Change the system timezone:

   sudo dpkg-reconfigure --frontend noninteractive tzdata

Update time using HTTP

htpdate utility

htpdate -s www.google.com

alternative

date -s "$(wget -S  "http://www.google.com/" 2>&1 | grep -E '^[[:space:]]*[dD]ate:' | sed 's/^[[:space:]]*[dD]ate:[[:space:]]*//' | head -1l | awk '{print $1, $3, $2,  $5 ,"GMT", $4 }' | sed 's/,//')"