sundapeng opened a new pull request, #9173:
URL: https://github.com/apache/paimon/pull/9173
### Purpose
Python counterpart of #7577. `DLFOpenApiSigner.sign_headers` built the RFC
1123 `Date` header with `strftime("%a, %d %b %Y %H:%M:%S GMT")`. Python's
`%a`/`%b` directives follow the process `LC_TIME`, so under non-English locales
(e.g. zh_CN, ja_JP) the header is localized (e.g. `二, 11 8月 2026 14:30:05 GMT`
instead of `Tue, 11 Aug 2026 14:30:05 GMT`), which breaks the Aliyun OpenAPI
signature.
This switches to `email.utils.format_datetime(..., usegmt=True)`, which is
locale-independent and always emits English day/month names with the identical
output format.
### Tests
- Add `test_openapi_date_format_with_chinese_locale` and
`test_openapi_date_format_with_japanese_locale`, mirroring the Java tests added
in #7577 (skipped when the locale is not installed on the system).
- All 11 tests in `dlf_signer_test.py` pass; flake8 clean.
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