nosmoking-days.py

#!/usr/bin/env python
# coding: utf-8
import datetime

START_DAY = datetime.date(2010, 10, 20)

def nosmoking_days(todate = None):
    if not todate:
        todate = datetime.date.today()
    delta = todate - START_DAY
    return delta.days

if __name__=='__main__':
    print(nosmoking_days())