Remove registration of pandas datetime converter in plotting

doc/whats-new.rst

@@ -27,6 +27,8 @@ New Features
 
 Breaking changes
 ~~~~~~~~~~~~~~~~
+- Rely on matplotlibs default converters instead of pandas (:issue:`6102`, :pull:`6109`).
+  By `Jimmy Westling <https://github.com/illviljan>`_.
 
 
 Deprecations

xarray/plot/utils.py

@@ -28,20 +28,9 @@
 ROBUST_PERCENTILE = 2.0
 
 
-_registered = False
-
-
-def register_pandas_datetime_converter_if_needed():
-    # based on https://github.com/pandas-dev/pandas/pull/17710
-    global _registered
-    if not _registered:
-        pd.plotting.register_matplotlib_converters()
-        _registered = True
-
-
 def import_matplotlib_pyplot():
     """Import pyplot as register appropriate converters."""
-    register_pandas_datetime_converter_if_needed()
+    # TODO: This function doesn't do anything, remove it?
     import matplotlib.pyplot as plt
 
     return plt