In the early days of using Ubuntu, I encountered that Ubuntu would set the BIOS time to UTC time.，This caused me to enter Windows，The time is wrong too。I recently reinstalled Manjaro and encountered the same situation.，Checked the information，The setting method is the same as before in ubuntu.。
timedatectl status # 可以先用此指令查看原本 RTC in local TZ 是不是 no， # 以及 Local Time 的時間。
Before I execute the command，Only Local time is correct，Universal time and RTC time both have a time difference of eight hours.
sudo timedatectl set-local-rtc 1 # 透過此指令將 RTC in local TZ 設為 yes， # 表示讓 RTC (Real Time Clock) 採用 Local Time 的時間。
After the setup is complete，RTC time is the time of Local time。
【參考連結】
- Lao Sen Chang Tan IT Help » 同步ubuntu與Windows時間
- Manjaro configures the accurate time (time is 8 hours faster) 2021-02-09 – Jane books
