you can do the test for RTC, into BIOS to set correct time than shout down the laptop and unplug all power include battery and adapter than after 24 or 48 hr, plug power to power on system into BIOS to see the time is correct or not. if time -5 or +5, it is ok, if over, you will send to RMA to check it.
also you can set time in control panel -> date and time.