from datetime import date

date_tups = [
(3, 28, 2020, 3908),
(4, 17, 2020, 3983),
(5, 7, 2020, 4140),
(6, 6, 2020, 4433),
(7, 1, 2020, 4559),
(9, 9, 2020, 4641),
(8, 31, 2018, 2039),
(12, 19, 2018, 2629)
]

dates = [date(d[2], d[0], d[1]) for d in date_tups]
print ("digraph G {")
for d1 in dates:
  for d2 in dates:
    if d2 >= d1:
      continue
    delta = d1 - d2
    # if delta.days % 5 == 0:
    print("\"%s\" -> \"%s\" [label=%d];" % (d1.isoformat(), d2.isoformat(), delta.days))

for d in date_tups:
  print("\"%s\" [label=Q%d]" % (date(d[2], d[0], d[1]).isoformat(), d[3]))
print("}")