In the enterprise software I help build, we have a date-picker with years in a normal select element. I've gotten the question to revert the way the years are displayed so they are displayed from high to low.
So to scroll up to go forward in years and down to go backwards in years.
I'm going to advise against it, but the only arguments I can come up with are about the convention. Both Android and Apple have year selects that go from low to high.
The only arguments I can think of that would speak for reverting it to high to low, are that fact that "up" is more synonym with "going forward". And that social feeds are normally displayed with most recent posts at the top.
Could you, smart people, think of more reasons to do it one way or the other? I would like more arguments in my arsenal, before going to the product owners.
The datepicker is component based. So it's used everywhere from birthday input to daterange pickers and your normal situations where you need to select a date. Users will primarily use it on desktop (previous Java app was only accessbile on desktop), but since our user base hasn't really shifted yet to using the new webapp we don't really have reliable data telling us if it will be used on mobile devices. We have some data, but that's primarily us testing it. We have plans to accommodate tablets, but tests have shown that most parts of the app are well accessible on later mobile devices too.