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

neutrinoceros · neutrinoceros · commit bb0047adb19b · 2026-04-23T09:33:06.000+02:00
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -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
     return dt
