I will state this briefly as a tangent. This article mentions third party libraries; the top are Arrow and Pendulum. These are a wellspring of subtle bugs due t

I will state this briefly as a tangent. This article mentions third party libraries; the top are Arrow and Pendulum. These are a wellspring of subtle bugs due to a decision they made that I suspect is based off the Javascript library Moment: They conflate Dates, Times, and Datetimes, as a single type. If you are using their Arrow etc type to represent a Date or Time, the resulting code will be fragile, and fail in surprising ways. Additionally, if my function signature accepts a time or date, you have no way of validating the parameter, and can do things like ask for "seconds" on a date. The moment/arrow/pendulum community advocates that the concept of a date or time individually is meaningless; I disagree. It is application specific, and there are applications that call for any of the 3 variants. Python's builtin `datetime` library has flaws as pointed out in the article, but is safer than Arrow or Moment. I think Rust's Chrono lib is the best datetime library I've seen, in terms of not surprising you with errors.