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timhoffm
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I'd rather have this explained in https://matplotlib.org/stable/users/explain/axes/axes_units.html
The note here should be shortend to something like
Date resolution is limited to approximately a microsecond. For details see [link].
Move the detailed explanation of Date resolution limits from the AutoDateLocator docstring to the "Plotting dates and strings" explainer page, and shorten the docstring note to a single sentence that links there, as suggested in the review.
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Done in e1c73ea - the AutoDateLocator note is now the shortened one-liner linking to the guide and the detailed explanation (including the nanosecond-timestamp example and the |
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PR summary
Following review feedback, the AutoDateLocator documentation now carries a short one-line note on the precision limits of matplotlib dates, linking to the explanation in the Plotting dates and strings explainer (
galleries/users_explain/axes/axes_units.py), which is where the detailed discussion now lives. The original scope followed timhoffm's suggestion in #23493.Because matplotlib dates are stored as floats of days since the epoch, nanosecond range timestamps lose their detail: close values collapse and the autoscaled view then spans years. I reproduced this locally and plotting the elapsed time as numpy.timedelta64 values gives a usable axis. The explainer section documents these limits and the options and links to the existing Date precision and epochs example.
Closes #23493
AI Disclosure
I used an AI coding assistant to explore the codebase and to run local experiments that verified the behavior documented here. I reviewed the docstring note and this PR text before submitting and the pre-commit checks pass locally on this branch.
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