Liberay
from datetime import date
date.days : return day (int)
Code
from datetime import date end_date = input().split() start_date = input().split() end = date(int(end_date[2]), int(end_date[1]), int(end_date[0])) start = date(int(start_date[2]), int(start_date[1]), int(start_date[0])) resl = (end - start).days
Ex)
input : 1 23 2018
1 20 2018
output : 3