The concept that the real time clock is programmed (firmware) to increment time on a given date would be ludicrous programming even for X10.
I agree. However, it is what it is. Several of us who've run with the CM15a
not connected to the PC over many years have confirmed that its firmware has the old DST dates hard-coded into it. Before Congress changed the DST dates last year, everything worked fine. Then after the change, we updated our Windows OS, and
our PC's used the new dates, but the CM15a still used the old dates. (Unless the CM15a was connected to the PC at the time.) This causes problems 4 times a year. Twice in the spring (when it changes the time and shouldn't, and when it doesn't change the time but should), and twice again in the fall. Until X10 supplies a fix, one solution seems to be to leave the CM15a connected to the PC during the critical Sunday morning changeovers. (Both the old dates and the new dates.) I'm doing that this year. We'll see what happens on Sunday morning.
On 11/3 daybreak is programmed for 8:21.
On 11/4 is set for 7:21 - end of story.
Am I missing something here?
If you're missing anything, I think it's again the issue of whether the CM15a is connected to the PC or not. The ActiveHome Pro application certainly seems to know when DST truly starts and ends. And that information seems to be available to the CM15a while it's connected. But when it's
not connected, it seems to fall back to its old dates ... which we assume must be hard-coded in its firmware.
By the way ... I personally think the whole DST concept is ridiculous. All of the reasons for its implementation are no longer valid, and now it's a huge waste of time and resources. There is no evidence that it saves any energy. In the summer we may not turn on our lights until later at night, but we have to leave them on longer in the morning. Do you know anybody who can explain why we have DST? (With a straight face?) I was impressed that Indiana
was one of the few states smart enough to not fall for the DST scam. But I guess they succumbed to peer pressure from neighboring states.