datetime.strptime's %z should support +HH

Feature or enhancement

Proposal:

The %z directive supports the UTC offset in the form ±HHMM[SS[.ffffff]]. Other parsing functions like fromisoformat on the other hand support the full format ±HH[MM[SS[.ffffff]]]. So there is no strptime format that supports the fromisoformat.

from datetime import datetime
datetime.fromisoformat("2023-05-25T15:35:05.666+01")  # ok
datetime.strptime("2023-05-25T15:35:05.666+01", "%Y-%m-%dT%H:%M:%S.%f%z")  # nok

The same may apply to %:z (https://github.com/python/cpython/issues/121237)

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-130390

從 datetime.strptime() 對 %z 指示詞的處理開始，並將其與 datetime.fromisoformat() 進行比較，以 issue 中的 +01 範例作為行為參考。檢查相同的考量是否適用於 %:z；當文件所述的 offset 形式能一致地被接受，且該範例有涵蓋時，即視為完成。