timedatectl

Shell
# timedatectl set-timezone “Asia/Kolkata”
# timedatectl list-timezones
# timedatectl  status
# timedatectl list-timezones |  egrep  -o “Asia/B.*”
# timedatectl list-timezones |  egrep  -o “Europe/L.*”
# timedatectl list-timezones |  egrep  -o “America/N.*”
# timedatectl 
OR
# timedatectl | grep Time

Source

Also in Shell: