Time zone is set to US pacific. I tried changing time format on the computer to 24 hrs time and did same in RR but that didn't change anything as far as the sunrise/sunset times. Sorry, I don't know what else to look at. I do know that I have always had this problem. I have never been able to use the GPS to set time of the computer and I have never gotten the sunrise/sunset times working to spite having this car computer up and running for years (though I recently replaced computer and op sys to win 7). That seems to leave the common denominator as the GPS. RR reads speed from the GPS just fine and when I put those coordinates into google maps it takes me to the place I expect.