System time - ArchWiki
Hardware clock. The hardware clock (a. k. a. the Real Time Clock (RTC) or CMOS clock) stores the values of: Year, Month, Day, Hour, Minute, and Seconds. Only 2016, or later, UEFI firmware has the ability to store the timezone, and whether DST is used. Read hardware clock # hwclock --show Set hardware clock from system clock. The following sets the hardware clock from the system clock.