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

Commencez par datetime.datetime.strftime et étudiez comment ses directives dépendent de la bibliothèque C sous-jacente sur les systèmes de type Unix et Windows. Examinez les PRs associés avant de commencer ; le travail sera considéré comme terminé lorsqu’une approche cohérente et décidée pour le formatage des jours et des mois sans zéros initiaux aura été définie sur toutes les plateformes.