@Buage_ wtf 😭 wait am I tripping or there is no button to say that the thing is right?

Could take longer I guess. It narrows possibilities down quickly.

There's no button for when it's correct‽

Strictly speaking, such a button is not needed. Once the range has been narrowed down to a single date, it could automatically proceed to the next step. However, the lack of such a button does force the user to take the maximum number of steps every time.

this is ux, not ui

I am guessing the range is non-inclusive of the edge values, so there's really no way to confirm the correctness once you land on the correct date and pressing either button automatically labels it incorrect and excludes it from the range. So I would argue that it is necessary

Also there's no way to go back when you make a mistake

Beauty of a binary search. It can find a single answer in no more than 20 steps