class_docstr: Determines the number of unique calendar days.
  
  Description:
      Given a list of datetimes, return the number of unique calendar
      days. The same date in two different years is counted as one. So
      Feb 21, 2017 is not unique from Feb 21, 2019.
  
  Examples:
      >>> from datetime import datetime
      >>> n_unique_days_of_calendar_year = NUniqueDaysOfCalendarYear()
      >>> times = [datetime(2019, 2, 1),
      ...          datetime(2019, 2, 1),
      ...          datetime(2018, 2, 1),
      ...          datetime(2019, 1, 1)]
      >>> n_unique_days_of_calendar_year(times)
      2
class_docstr_tok: ["Determines","the","number","of","unique","calendar","days",".","Description",":","Given","a","list","of","datetimes",",","return","the","number","of","unique","calendar","days",".","The","same","date","in","two","different","years","is","counted","as","one",".","So","Feb","21",",","2017","is","not","unique","from","Feb","21",",","2019",".","Examples",":",">",">",">","from","datetime","import","datetime",">",">",">","n_unique_days_of_calendar_year","=","NUniqueDaysOfCalendarYear","(",")",">",">",">","times","=","[","datetime","(","2019",",","2",",","1",")",",","...","datetime","(","2019",",","2",",","1",")",",","...","datetime","(","2018",",","2",",","1",")",",","...","datetime","(","2019",",","1",",","1",")","]",">",">",">","n_unique_days_of_calendar_year","(","times",")","2"]
code: def get_function(self):
      def n_unique_days_of_calendar_year(x):
          return x.dropna().dt.strftime("%m-%d").nunique()
  
      return n_unique_days_of_calendar_year
  
imports: from woodwork.column_schema import ColumnSchema
  from woodwork.logical_types import Datetime, Integer
  from featuretools.primitives.base import AggregationPrimitive
label_desc: Use image node_id 1 for calling the NUniqueDaysOfCalendarYear obj's underlying member method code with example usage: obj.get_function() and returns: n_unique_days_of_calendar_year, x