Debian Jessie: configure timezone using cli

Using timedatectl

To list timezone:

# timedatectl list-timezones | grep Jakarta
Asia/Jakarta

To set timezone:

# timedatectl set-timezone Asia/Jakarta

To show (or # timedatectl status):

# timedatectl
      Local time: Tue 2017-04-04 07:33:53 WIB
  Universal time: Tue 2017-04-04 00:33:53 UTC
        RTC time: Tue 2017-04-04 00:33:53
       Time zone: Asia/Jakarta (WIB, +0700)
     NTP enabled: no
NTP synchronized: yes
 RTC in local TZ: no
      DST active: n/a

tzconfig deprecated

# tzconfig --help
WARNING: the tzconfig command is deprecated, please use:
 dpkg-reconfigure tzdata

References:

• http://www.server-world.info/en/note?os=Debian_8&p=timezone 
• https://debian-administration.org/article/213/Changing_the_timezone_of_your_Debian_system
• https://www.debian.org/doc/manuals/system-administrator/ch-sysadmin-time.html
• https://www.freedesktop.org/software/systemd/man/timedatectl.html