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BUG: avoid a deprecation warning from numpy 2.5 (calling datetime64('NaT') without a unit is deprecated) #31554

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Merged
story645 merged 2 commits into from
Apr 23, 2026
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BUG: avoid a deprecation warning from numpy 2.5 (calling datetime64('NaT') without a unit is deprecated) #31554

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BUG: avoid a deprecation warning from numpy 2.5 (calling `datetime64(…
neutrinoceros Apr 23, 2026
09ec367
Update dates.py
neutrinoceros Apr 23, 2026
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2 changes: 1 addition & 1 deletion lib/matplotlib/dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -325,7 +325,7 @@ def _dt64_to_ordinalf(d):
dt += extra.astype(np.float64) / 1.0e9
dt = dt / SEC_PER_DAY

NaT_int = np.datetime64('NaT').astype(np.int64)
NaT_int = np.datetime64('NaT', 's').astype(np.int64)
d_int = d.astype(np.int64)
dt[d_int == NaT_int] = np.nan
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return dt
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