[OJFord]

What if your 'business hour' was 0130[^] (business logic for some reason, rather than a working hour, presumably; hence quotes) - what do you want to happen when you go in to Summer time, or come out of it? Does everybody want the same thing? Is it even obvious what it probably does such that nobody's going to have a bad night?

[^] in the UK at least, clocks go forward skipping the hour 0100-0200, and repeat it when they go back. If that happens at a different time where you are (this hypothetical feature gets even more complicated! and) then I mean whatever appropriate time for my point to make sense.

[Xorlev]

Not entirely sure why you're being downvoted, but it's true.

Sometimes you need something to run at 9am daily, in your local time zone. If your local time zone shifts for daylight savings, you can't define it in UTC without changing it twice a year.