If the time of the unit is not consistent with your local time, you should set the correct time zone in 'setting'->'more settings'->'date & time'.

If after the correct time zone is set but it's still one hour off, then you can try to set DST in 'setting'->'date and time'. If that doesn't work, then it's a software bug. One work-around is to set the time zone to one hour ahead; for example, you set it to 'mountain time' when you are in California.