BUG: use more generic type inference for fast plotting

xref pandas-dev#15073

Author: jreback

pandas/tseries/converter.py

@@ -14,7 +14,7 @@
 from pandas.types.common import (is_float, is_integer,
                                  is_integer_dtype,
                                  is_float_dtype,
-                                 is_datetime64_ns_dtype,
+                                 is_datetime64_any_dtype,
                                  is_period_arraylike,
                                  )
 
@@ -172,7 +172,7 @@ def _dt_to_float_ordinal(dt):
     is a :func:`float`.
     """
     if (isinstance(dt, (np.ndarray, Index, Series)
-                   ) and is_datetime64_ns_dtype(dt)):
+                   ) and is_datetime64_any_dtype(dt)):
         base = dates.epoch2num(dt.asi8 / 1.0E9)
     else:
         base = dates.date2num(dt)