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BUG: Fix ValueError when plotting DataFrame with descending DatetimeI…#64826

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anubhav9369 wants to merge 3 commits intopandas-dev:mainfrom
anubhav9369:fix-backwards-datetime-plot
Open

BUG: Fix ValueError when plotting DataFrame with descending DatetimeI…#64826
anubhav9369 wants to merge 3 commits intopandas-dev:mainfrom
anubhav9369:fix-backwards-datetime-plot

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@anubhav9369 anubhav9369 commented Mar 24, 2026 •
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  • closes BUG: DataFrames with backwards time index cannot be plotted #64819
  • Tests added and passed if fixing a bug or adding a new feature
  • All code checks passed
  • Added type annotations to new arguments/methods/functions.
  • Added an entry in the latest doc/source/whatsnew/v3.1.0.rst file if fixing a bug or adding a new feature.
  • I have reviewed and followed all the contribution guidelines
  • If I used AI to develop this pull request, I prompted it to follow AGENTS.md.
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anubhav9369 commented Mar 24, 2026

All failures are due to the pre-existing flaky test test_no_track_times (GH#32682) in test_store.py, which checks HDF5 file checksums based on timing unrelated to this plotting fix. This test was already failing on main before this PR.
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anubhav9369 commented Mar 24, 2026

macOS py312 runs 223k tests with 0 failures.
Happy to rebase or make any changes the maintainers suggest.
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