@MichielS if you are in a UTC+1 timezone try selecting UTC+1 Africa/Algiers as they don't observe daylight saving. That might do it...

OK so I've got a workaround. In the Kasa app force the TimeZone to a different one than say "UTC Europe/London" which it automatically detected. I initially picked UTC-1 to see if that sorted it but...

Since the clocks changed, my two HS100's have not adjusted their internal clocks. Opening the Kasa app I forced the location sync but if I look at each device under DeviceInfo, the wrong time is...