The clock must be reset after powering down. Note: If I reset the clock then power down, then immediately power up, the clock has the correct time. I tested this today, I reset powered down waited 5 minutes and added power, the clock had the correct time. I repeated this exercise 4 times, with the correct time displayed. I then waited 30 minutes powered up, the clock was wrong +7 hours and 14 minutes. Interesting thing is the D180 was the unit tested, I powered down he D180 and powered up the D100 and the time was correct. I then power up the D180 and the time on the D100 changed to the incorrect time. I powered down the D180 to see if the D100 would reset to the correct time, it did not. Additionally, I note that each unit internal battery was reading 15.3 and 15.0 volts at +40F. What's the magic fix? Dan