The PlayStation 2 real time clock (RTC) - frno7/linux GitHub Wiki

The PlayStation 2 hardware clock is designed to keep Japan standard time (JST), regardless of the region of the machine. This is adjusted in the driver so that the clock to the kernel appears to be kept in coordinated universal time (UTC). Tools such as hwclock should therefore set the clock in the UTC timescale. The standard date tool can display and set time and date.