Открываем терминал Ctrl+Alt+T, и пишем следующие команды:
Включаем локальное время:
sudo timedatectl set-local-rtc 1 --adjust-system-clock
Смотрим статус:
sudo timedatectl
Вывод в терминале:
Local time: Сб 2025-08-09 13:40:20 +07
Universal time: Сб 2025-08-09 06:40:20 UTC
RTC time: Сб 2025-08-09 13:40:20
Time zone: Asia/Novosibirsk (+07, +0700)
System clock synchronized: yes
NTP service: active
RTC in local TZ: yes
Warning: The system is configured to read the RTC time in the local time zone.
This mode cannot be fully supported. It will create various problems
with time zone changes and daylight saving time adjustments. The RTC
time is never updated, it relies on external facilities to maintain it.
If at all possible, use RTC in UTC by calling
'timedatectl set-local-rtc 0'.
Выключаем локальное время:
sudo timedatectl set-local-rtc 0