DST in AHP
How does ActiveHome Pro know when Daylight Savings Time is?
Since there are enough places in the US that do not use Daylight Savings Time anyhow, AHP copies the settings from your computer. If you have Windows Update turned on, that should keep your Daylight Savings Time information in sync with whatever changes are made. If your CM15A has been running by itself for a very long time, you may want to hook it back up to the PC and run Tools-Download Timers and Macros to make sure it has the correct dates for Daylight Savings Time.