I have this problem with the timezone being off by an hour too (presumably daylight savings time) and it’s greyed out so I cannot correct it manually. Currently, it is actually 10:24pm and my opensprinkler device shows 21:22pm. I have NTP enabled and it’s pointing at my local NTP device, when I reboot the OS device I can see packets come through on the NTP port so I’m pretty sure it’s sync’ing up. Per Ray’s suggestion in 2015, I even enabled the WUnderground API key but that did not seem to correct the Timezone value from -07:00 to -06:00 (which is what it should be for my location). I tried changing the location manually (east coast/west coast) but the Timezone value seems to persist and always be greyed out. :-/