docs: def format_time(x):
      """Formats date values
  
      This function formats :class:`datetime.datetime` and
      :class:`datetime.timedelta` objects (and the corresponding numpy objects)
      using the :func:`xarray.core.formatting.format_timestamp` and the
      :func:`xarray.core.formatting.format_timedelta` functions.
  
      Parameters
      ----------
      x: object
          The value to format. If not a time object, the value is returned
  
      Returns
      -------
      str or `x`
          Either the formatted time object or the initial `x`"""
      if isinstance(x, (datetime64, datetime)):
          return format_timestamp(x)
      elif isinstance(x, (timedelta64, timedelta)):
          return format_timedelta(x)
      elif isinstance(x, ndarray):
          return list(x) if x.ndim else x[()]
      return x