Thsi explains it. A computer has a cmos clock which keeps running when the computer is switched off. Normally when the computer boots the time is taken from this clock, not from the Web. When the battery runs out (or accasionally appears defective), the cmos clock may run significantly behind. YOu can change teh battery on the motherboard if you wish but if it's a new computer you are probably better off contacting the manufacturer.
P.S. Maybe TWS check the cmos clock as well, not only the Windows time.