It use to be I only needed to worry about AHP and just the dusk dawn settings when this occurred.
However with Alexa, Google home and lesser so Cortana skills(many because there are less of these) there are many more ways this can get screwed up.
I don't have many timers working for the weekend and those that do if their off by an hour it is no big deal( I suspect that is true for most users).
Through the week is where more will notice this.
You'd think apps that run on a phone could get this right. However even cloud based systems can't get this right
Case in point, I have two apps (both official apps for Broadlink) these have timers to turn on my TV and Cable box at a set time 6:45 am the mornings through the week days.
This morning the TV didn't come on I checked the timer in one app(IHC) and the timer had changed to 19:45
I then thought I'll check eControll since when you set a timer in one the other app picks it up so I suspected the timer there to also be 19:45 it wasn't
it was 07:45
I realize not every where on planet earth do we experiance DST at the same time of year thus this can get tricky for programers.
But come on, regular timers shouldn't change, just the clock.
I've just started to look at other skills for timer issues created from DST but I don't have many outside the WM100 now.
Alexa timers seem to be still ok and I'd expect that being located in North America.
Google I don't use for timed events nor do I have any skills enabled for it other then SmartThings
Cortana I also don't use Timers and only have the SmartThings app installed for it.
Although there is no Skill as yet for the WM100, being is it has a clock that needs resyncing timers were off.
But they were all still set to the same time.
So if your timers come on late today from the WM100 the issue is not just with it, and it could be worse!