[mjevans]

I did cover that:

""" None of the examples in the article use a more vague syntax, such as "0 days before the end of the month". """

As another reply points out, it's incrementing the Month set of buckets. I'll also extend with other results I expect:

  2020-12-31 .plus(1 months) => 2021-01-31
  2020-12-31 .plus(2 months) => 2021-02-28
  2020-12-31 .plus(3 months) => 2021-03-31
  2020-12-31 .plus(4 months) => 2021-04-30

A normal human has several options, and truncating to stay within the month makes the most sense to the most people most of the time. It's perfectly reasonable to take that step when resolving the indicated date to a representable value.

I'll go further: JodaTime probably isn't focused on Precision Date Calculations; it behaves very much the way I expect someone working with forms and fields, general CRUD enterprisy software stuff, would want auto-filled dates to work.

[kaishiro]

Maybe I'm just being thick (it's usually the case), but for the life of me I still don't know what your answer to the parent's question is, and I can't tell how your quoted part is supposed to answer it.

[mjevans]

My 2 higher levels post post included an alternate phrasing of the test case they specified:

""" None of the examples in the article use a more vague syntax, such as "0 days before the end of the month". """

---

They asked:

""" What’s Feb 28th + 1 month?

Does the human expect the last day of March? Or the 28th day of March? """

---

It's implicit, the human only expects the month to change, because the input isn't a descriptive phrase "the end of the month" adjusted or not, it's a literal date. That's why my other test cases show the same behavior for the end of the month.