gh-137165: Standardized non-zero-padded date formatting for datetime.strftime

[F0RRZZ]

Previously, using non-zero-padded directives (e.g., %-d) in strftime caused test failures on Windows and Android (x86_64), while other platforms worked as expected.
This has been fixed by manually handling such specifiers on these platforms.
Corresponding tests have been added to strftime tests.

On Windows using non-zero-padded directives raised ValueError.

On Android (x86_64) dicrectives were not replaced:

• Closes Enhancement Proposal: Standardized Support for Non-Zero-Padded Day and Month Formatting in datetime.strftime #137165

[mhsmith]

!buildbot iOS

[mhsmith]

The implementation looks reasonable, but this should also be covered in the documentation, along with the fact that the - flag apparently has no effect on %y on Apple platforms.

[F0RRZZ]

@mhsmith I adapted the tests for iOS and added documentation in the strftime notes.

[F0RRZZ]

@StanFromIreland Made all changes

[F0RRZZ]

@mhsmith All done, but TSan seems to be stuck

[StanFromIreland]

!buildbot Windows11.Refleaks

Third time lucky!

[F0RRZZ]

@mhsmith Fixed, lets test

[mhsmith]

I've started the refleaks tests, but I suggest you work out how to run them on your own machine rather than requiring a team member to rerun them on every commit. I don't know exactly how to do this, but it looks like it involves the -R option of python -m test. See the buildbot configuration for more details.

[F0RRZZ]

@mhsmith Thanks! I'm running them on my machine, I just thought they needed to be run here as well to make sure everything works

[mhsmith]

Thanks, this looks much better. Just a few stylistic comments:

[F0RRZZ]

@mhsmith All done

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @mhsmith for commit 9212a5a 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F139088%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[mhsmith]

@pganssle: I think this is ready for final review.