The US switched to summer time a week ago. I was expecting the Mark panel to change the clock time on my system since the daylight saving schedule is programmed. It did not happen. I then set the time one hour ahead manually on the panel and at first everything looked fine ... but at some point the system clock moved back by one hour. I also have a Wiser on the same system, so I tried setting the Wiser one hour ahead, the time changed but reversed back later. I then tried by synchronizing the time through a Piced upload. The clock on the Mark, the Wiser and every DLT seemed fine ... but a few hours later I noticed everything had reverted to winter time. (I don't know how long it takes before switching back ). By the way wiser is enable to use NTP and also has t switch to daylight saving time. Apparently something else on my system is opposing my efforts ! The other components that allow time setting that I have installed are thermostats. Can anyone explain to me what might be going one ?