Enhancement Proposal: Standardized Support for Non-Zero-Padded Day and Month Formatting in datetime.strftime

Feature or enhancement

Proposal:

Python's datetime.datetime.strftime supports formatting directives for dates and times, such as %d for zero-padded days and %m for zero-padded months.
While there are platform-specific ways to get non-zero-padded day (%-d on Unix) or month (%-m), these do not work reliably across all platforms.. Particularly between Unix-like systems and Windows.

from datetime import datetime

dt = datetime(2025, 6, 6)

# On Unix:
dt.strftime("%-d. %-m. %Y")  # '6. 6. 2025'

# On Windows:
dt.strftime("%-d. %-m. %Y")  # Raises ValueError

I understand that strftime relies on the underlying C library for formatting, which is probably why this behavior differs between platforms. That said, if it's not practical to change this at the core level, maybe there could be some kind of wrapper or Python-level normalization to make things more consistent across systems.

Currently this requires a workaround such as usage of .format directly on the datetime object.

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-138982
• gh-139002
• gh-139088
• gh-145018

从 datetime.datetime.strftime 开始，调查其指令在类 Unix 系统和 Windows 上如何依赖底层 C 库。在开始之前查看已链接的 PRs；确定一种在各平台上对不带前导零的日和月进行格式化的一致方案，即表示完成。