code: def infer_doy_max(arr):
      
      cal = arr.time.encoding.get('calendar', None)
      if cal in calendars:
          doy_max = calendars[cal]
      else:
          # If source is an array with no calendar information and whose length is not at least of full year,
          # then this inference could be wrong (
          doy_max = arr.time.dt.dayofyear.max().data
          if len(arr.time) < 360:
              raise ValueError("Cannot infer the calendar from a series less than a year long.")
          if doy_max not in [360, 365, 366]:
              raise ValueError("The target array's calendar is not recognized")
  
      return doy_max
docs: Return the largest doy allowed by calendar.
  
      Parameters
      ----------
      arr : xarray.DataArray
        Array with `time` coordinate.
  
      Returns
      -------
      int
        The largest day of the year found in calendar.