A function within a class is referred to as a method


d1 = Date(7,20,2021)

d2 = Date(7,21,2021)

d3 = Date(10,28,1958)

constructor method __init__  mandatory
pretty print method __str__   optional, but good to write


print(d1)

20 July, 2021


def tomorrow(self):
  days_in_month = {1:31, 2:28, }.....
  
  SPECIAL CASES
  for a last day of the month:
  case 1: last month (December)  tomorrow would be Date(1,1,self._year+1)
  case 2: leap year february
  case 3: non-leap year february
  
  GENERAL CASE
   return Date(self._month,self._day+1,self._year)
  
  

if c1:
  ...
elif c2:
  ...
elif c3:


else:
   # general case
   return Date(self._month,self._day+1,self._year)