Interestingly enough, I went into the app on Sunday and applied my profile without making any changes and the lighting schedule was adjusted to DST.
I know the schedule goes with a 24-hour clock, so the commend to turn on the lights at 0700 is the same command regardless of whether we are in DST or not.
The end result was that I did not have to make any changes to my lighting schedule at all and perhaps the 24-hour schedule may be the reason why a time change has no effect ?
The bigger question is "Where is the controller getting the time from ?" Does it somehow sync and store the time from my phone when I apply a profile? or just get the time from the router/internet?
Anyway, problem solved but I thought the end result was an very interesting answer :)