Change time zone in CoreOS
timedatectl list-timezones | grep Kiev
Europe/Kiev
sudo timedatectl set-timezone Europe/Kiev
timedatectl status
Local time: Wed 2017-11-29 13:41:12 EET
Universal time: Wed 2017-11-29 11:41:12 UTC
RTC time: Wed 2017-11-29 11:41:12
Time zone: Europe/Kiev (EET, +0200)
Network time on: no
NTP synchronized: yes
RTC in local TZ: no