I would have thought that since the Empulse knows the date that it would adjust for DST, but my clock was an hour off. In case you are wondering how to fix it, here are the instructions posted by CAT in another thread...
http://brammoforum.com/index.php?topic=1766.msg14279#msg14279SETTING THE TIME
The time and date on your Empulse were set at the factory to Pacific Standard Time. If you need to adjust the time on your Empulse:
1. Connect the charging connector to the Empulse and a wall outlet. This will put the Empulse in charging mode.
2. Press and hold the Mode (Black) and Trip (Green) buttons simultaneously for approximately two seconds to enter Setup mode.
3. Press the Mode button (Black) to select either HOURS or MINUTES.
4. Press the Trip (Green) button to increase the selected setting.
5. Once you have finished adjusting the time, press the MODE button to select EXIT and then press the Trip button to confirm.
Note: If no button is pressed for more than 30 seconds, the Empulse will revert back to Charging mode.
6. Disconnect the charging connector from the Empulse.
I've also added this info to the Wiki under Maintenance->Empulse