sequence_num.py

"""
y2k

19016 -> 01/23/2020
0 = 12/31/1967
1 = 01/01/1968
"""

import sys
from datetime import datetime, timedelta

if len(sys.argv) != 2:
  sys.exit('Enter sequence number <int>')

sequence = int(sys.argv[1])
if isinstance(sequence, int):
  specific_date = datetime(1967, 12, 31)
  new_date = specific_date + timedelta(sequence)
  print(new_date.strftime("%Y-%m-%d"))

else:
  print('Enter sequence number <int>')