Do you mean the new default datetime resolution of microseconds instead of the previous nanosecond resolution? Obviously this will require adjustments to any code that requires ns resolution, but I'd bet that's a tiny minority of all pandas code ever written. Do you have a particular use case in mind for the problems this will cause?

I would describe it as the huge majority, reflecting on my pandas use over the years. Pretty much all of the data worth exploring in pandas over excel, some data gui, or polars involves timestamps.

Yeah, but is nanosecond-level resolution necessary? In many scenarios, a resolution of one second is adequate.

I don't need nanosecond accuracy. I just know there are a lot of scripts expecting it.