Many many years ago a few of us were looking at the data sheet for a digital clock chip. It was pretty cool compared to some, and one feature was that it could do daylight savings automatically. If you tied one pin high this feature was enabled. Then we read the fine print. The days of the change were hard wired in, and would have been correct in about 1980 for the US. That was it. Since we were in Australia we thought this was hilarious. Worse of course, even for the US the feature was useless.
Daylight saving time shifts are something governements love to mess with. There is little to no chance that any of the rules will remain stable. If anything gratuitous changes have become more, not less, common. So any device that claims to have the “latest” rules already has a use by date. The only mechanism I know of that is at all reliable is the Unix ZIC system. And that only works because it is maintained and updates are available.