Finding date in two dates range by Python

finding_date.py

from datetime import date, timedelta, datetime
start_date = date(2018,1,1)
end_date = datetime.now()
every_month = 28

def finding_date(start_date, end_date, every_month):
    start_month = start_date.month
    end_months = (end_date.year-start_date.year)*12 + end_date.month
    has_month = []
    has_not = 0
    
    for month in range(start_month, end_months + 1):
        year = (month-1)//12 + start_date.year
        month = (month-1) % 12 + 1
        
        # last_date_of_month = date(year, month, 1) - timedelta(days=1)
        try:
            has_month.append(date(year, month, every_month))
        except ValueError as e:
            has_not += 1
            #print(e)
    return len(has_month), has_not

correct, incorrect = finding_date(start_date, end_date, every_month)
if incorrect == 0:
    print('Every month date is correct {}'.format(every_month))
else:
    print('Your start date {0} to end date {1} has only {2} months {3} date '.format(start_date, end_date, correct, every_month))