Python, 爽!
from datetime import date
try:
while True:
s1 = input()
s2 = input()
x = date(int(s1[:4]), int(s1[4:6]), int(s1[6:8]))
y = date(int(s2[:4]), int(s2[4:6]), int(s2[6:8]))
res = abs((x - y).days) + 1
print(res)
except EOFError:
pass